| 1. |
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| 2. |
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| 3. |
- Augustsson, Christian, 1966-, et al.
(author)
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Analys av träningstider inom föreningsidrotten. En studie av sju lagidrotter sett ur ett ålders- och könsperspektiv
- 2007
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Reports (other academic/artistic)abstract
- I Riksidrottsförbundets (RF) styrdokument Idrotten vill framgår att ett av de centrala målen för idrottsrörelsen är att alla som vill, oavsett ålder eller kön, ska få delta i den organiserade föreningsidrotten. För att uppnå detta mål krävs bland annat att fördelningen av träningstiderna, men även tillgängligheten till de olika träningsanläggningarna är jämlikt fördelade. Mot bakgrund av detta har syftet med studien varit att beskriva, kartlägga och analysera fördelningen av träningstider ur ett ålders- och könsperspektiv samt utifrån olika lagidrotter.Datainsamlingen genomfördes av Centrum för Marknadsanalys AB (CMA) och riktade sig till 417 (av totalt 6 800) slumpvis utvalda föreningar inom idrotterna bandy, basket, fotboll, handboll, innebandy, ishockey och volleyboll. Målgruppen för undersökningen var de idrotter som hade flest antal utövare och tillhörde kategorin lagidrotter. En ytterligare avgränsning var att respektive förening skulle bedriva verksamhet för såväl pojkar som flickor. Vid datainsamlingen kontaktades föreningarna inledningsvis via telefon, där ett antal attitydfrågor ställdes. Föreningarna skickade sedan in träningsscheman till CMA som registrerade materialet i en databas. På grund av svårigheter att nå alla föreningar via telefon, kompletterades undersökningen med ett brevledes utskick till slumpmässigt utvalda föreningar. Den slutgiltiga analysen, bearbetningen och avrapporteringen utfördes av forskargruppen Idrottsvetenskap på Karlstads universitet.Resultaten visar att majoriteten av de undersökta föreningarna har prioriteringsordningar för fördelning av träningstider och att dessa i första hand baseras på ålder och nivå på utövandet. I snitt driver 1 av 10 föreningar egna anläggningar där fotbollen dominerar med 1 av 5 föreningar med egen anläggning. Resultaten pekar på att fördelningen av träningstider i olika typer av anläggningar följer ett relativt traditionellt mönster inom de flesta undersökta idrottsgrenarna. Principen är att ju yngre deltagare i lagen desto tidigare träningstid. Man kan inte heller utläsa i materialet att någon grupp, pojkar eller flickor, skulle vara särskilt förfördelade, vilket överensstämmer med resultat från tidigare studier inom området.Denna studie pekar på ytterligare behov av såväl bred som fördjupad kunskap i frågor somrör detta angelägna problemområde. I framtida studier bör man således låta flera delar av idrotts-Sverige ingå i urvalet. Vidare bör de mest populära individuella idrottsgrenarna för unga idrottareingå. I detta sammanhang är det också relevant att kunna undersöka och analysera kvaliteten påde anvisade anläggningarna, då detta indirekt kan vara ett mått på en prioriteringsordning. I diskussionen förslås två rekommendationer, där den första vänder sig till landets kommuneroch andra ägare och förvaltare av idrottsanläggningar och RF. I de uthyrningsbestämmelser och principer för fördelning av tider som upprättas, skall det klart vara inskrivet att man beaktar att tiderna skall fördelas på ett sådant sätt att man eftersträvar ett tydligt jämställdhetsperspektiv. Den andra rekommendationen ges till Sveriges skolor och den handlar om ett fördjupat samarbete mellan skolor och idrottsföreningar likt Handslagets satsning på integrering mellan skola och föreningsliv.
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| 4. |
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| 5. |
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| 6. |
- Josefson, Kristina, et al.
(author)
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Student participation in developing student feedback
- 2011
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In: Quality in Higher Education. - : Informa UK Limited. - 1353-8322 .- 1470-1081. ; 17:2, s. 257-262
-
Journal article (peer-reviewed)abstract
- Sweden has a high level of student influence. At Lund University, students are not viewed as counterparts but partners in the university’s activities. Lund University has carried out Student Satisfaction Surveys (baromoters) since the 1990s and an overview has shown that an evaluation culture has grown during the past decade. It is, however, time to pose the critical question: do we ask the right questions? It is important that course evaluations and the institution-wide barometers complement each other without too much overlap. This article proposes a different way to carry through a barometer, where students’ experience mirrors the responses of alumni.
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| 7. |
- Kivimaki, A., et al.
(author)
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Field ionization of high-Rydberg fragments produced after inner-shell photoexcitation and photoionization of the methane molecule
- 2015
-
In: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 143:11
-
Journal article (peer-reviewed)abstract
- We have studied the production of neutral high-Rydberg (HR) fragments from the CH4 molecule at the C 1s -> 3p excitation and at the C 1s ionization threshold. Neutral fragments in HR states were ionized using a pulsed electric field and the resulting ions were mass-analyzed using an ion time-of-flight spectrometer. The atomic fragments C(HR) and H(HR) dominated the spectra, but molecular fragments CHx(HR), x = 1-3, and H-2(HR) were also observed. The production of HR fragments is attributed to dissociation of CH4+ and CH42+ ions in HR states. Just above the C 1s ionization threshold, such molecular ionic states are created when the C 1s photoelectron is recaptured after single or double Auger decay. Similar HR states may be reached directly following resonant Auger decay at the C 1s -> 3p resonance. The energies and geometries of the parent and fragment ions have been calculated in order to gain insight into relevant dissociation pathways. (C) 2015 AIP Publishing LLC.
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| 8. |
- Kivimaki, A., et al.
(author)
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Synchrotron excitation - field ionization studies of high-Rydberg fragments produced after inner-shell ionization of small molecules
- 2015
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In: Journal of Physics: Conference Series. - : IOP Publishing. - 1742-6596 .- 1742-6588. ; 635, s. 112121-112121
-
Conference paper (peer-reviewed)abstract
- We have studied the production of neutral high-Rydberg (HR) fragments in small molecules after inner-shell excitation and ionization. Such fragments were ionized using a pulsed electric field and resulting ions were mass-analyzed with an ion time-of-flight (TOF) spectrometer. As an example, the results obtained at the C 1s ionization threshold of the methane molecule will be discussed.
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| 9. |
- Kivimäki, Antti, et al.
(author)
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Fragmentation of Methanol Molecules after Core Excitation and Core Ionization Studied by Negative-Ion/Positive-Ion Coincidence Experiments
- 2018
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In: Journal of Physical Chemistry A. - : American Chemical Society (ACS). - 1089-5639 .- 1520-5215. ; 122:1, s. 224-233
-
Journal article (peer-reviewed)abstract
- We have studied the fragmentation of the methanol molecule after core excitation and core ionization by observing coincidences between negative and positive ions. Five different negative ions – H-, C-, CH-, O-, and OH- – were observed at both the C 1s and O 1s edges. As negative ion formation occurs after resonant and normal Auger decay of core-hole states, it is necessarily linked with the release of positively charged fragments. Our data show that such fragmentation can happen in many different ways: We found approximately 30 negative-ion/positive-ion/positive-ion coincidence (NIPIPICO) channels. All involve only singly charged positive ions. Fragmentation channels leading to atomic ions are the most probable, but positive molecular ions are also frequently found in the context of anion formation. Coincidence yields as a function of photon energy were determined for the most intense NIPIPICO channels. Adding together the data measured at different photon energies, we could also verify the occurrence of four-ion coincidences, which involved one negative ion (H- or O-) and three positive ions.
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| 10. |
- Kivimäki, Antti, et al.
(author)
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Negative-ion/positive-ion coincidence spectroscopy as a tool to identify anionic fragments : The case of core-excited CHF3
- 2020
-
In: Journal of Mass Spectrometry. - : Wiley. - 1076-5174 .- 1096-9888. ; 55:5
-
Journal article (peer-reviewed)abstract
- We have studied the dissociation of the trifluoromethane molecule, CHF3, into negative ionic fragments at the C 1s and F 1s edges. The measurements were performed by detecting coincidences between negative and positive ions. We observed five different negative ions: F−, H−, C−, CF−, and F2 −. Their production was confirmed by the analysis of triple coincidence events (negative-ion/positive-ion/positive-ion or NIPIPI coincidences) that were recorded with cleaner signals than those of the negative-ion/positive-ion coincidences. The intensities of the most intense NIPIPI coincidence channels were recorded as a function of photon energy across the C 1s and F 1s excitations and ionization thresholds. We also observed dissociation channels involving the formation of one negative ion and three positive ions. Our results demonstrate that negative-ion/positive-ion coincidence spectroscopy is a very sensitive method to observe anions, which at inner-shell edges are up to three orders of magnitude less probable dissociation products than cations.
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| 11. |
- Kivimäki, Antti, et al.
(author)
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Yields and Time-of-Flight Spectra of Neutral High-Rydberg Fragments at the K Edges of the CO2 Molecule
- 2016
-
In: The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory. - : American Chemical Society (ACS). - 1089-5639. ; 120:25, s. 4360-4367
-
Journal article (peer-reviewed)abstract
- We have studied the production of neutral fragments in high-Rydberg (HR) states at the C 1s and O 1s edges of the CO2 molecule by performing two kinds of experiments. First, the yields of neutral HR fragments were measured indirectly by ionizing such fragments in a static electric field and by collecting resulting singly charged positive ions as a function of the photon energy. Such measurements reveal not only excitations below the core ionization thresholds but also thresholds for single core-hole and shakeup photoionization. Second, we obtained the mass spectra of neutral HR fragments at selected photon energies by exploiting pulsed field ionization; they show atomic fragments C(HR) and O(HR). We discuss dissociation pathways leading to the production of neutral HR fragments in core excitation and ionization of CO2.
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| 12. |
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| 13. |
- Kühn, Danilo, et al.
(author)
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Capabilities of Angle Resolved Time of Flight electron spectroscopy with the 60 degrees wide angle acceptance lens
- 2018
-
In: Journal of Electron Spectroscopy and Related Phenomena. - : Elsevier. - 0368-2048 .- 1873-2526. ; 224, s. 45-50
-
Journal article (peer-reviewed)abstract
- The simultaneous detection of energy, momentum and temporal information in electron spectroscopy is the key aspect to enhance the detection efficiency in order to broaden the range of scientific applications. Employing a novel 60 degrees wide angle acceptance lens system, based on an additional accelerating electron optical element, leads to a significant enhancement in transmission over the previously employed 30 degrees electron lenses. Due to the performance gain, optimized capabilities for time resolved electron spectroscopy and other high transmission applications with pulsed ionizing radiation have been obtained. The energy resolution and transmission have been determined experimentally utilizing BESSY II as a photon source. Four different and complementary lens modes have been characterized. (C) 2017 The Authors. Published by Elsevier B.V.
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| 14. |
- Kukk, E., et al.
(author)
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Energy-dependent timescales in the dissociation of diiodothiophene dication
- 2023
-
In: Physical Chemistry Chemical Physics. - : Royal Society of Chemistry (RSC). - 1463-9076 .- 1463-9084. ; 25:7, s. 5795-5807
-
Journal article (peer-reviewed)abstract
- Photodissociation molecular dynamics of gas-phase 2,5-diiodothiophene molecules was studied in an electron-energy-resolved electron-multi-ion coincidence experiment performed at the FinEstBeAMS beamline of MAX IV synchrotron. Following the photoionization of the iodine 4d subshell and the Auger decay, the dissociation landscape of the molecular dication was investigated as a function of the Auger electron energy. Concentrating on an major dissociation pathway, C4H2I2S2+ -> C4H2S+ + I+ + I, and accessing the timescales of the process via ion momentum correlation analysis, it was revealed how this three-body process changes depending on the available internal energy. Using a generalized secondary dissociation model, the process was shown to evolve from secondary dissociation regime towards concerted dissociation as the available energy increased, with the secondary dissociation time constant changing from 1.5 ps to 129 fs. The experimental results were compared with simulations using a stochastic charge-hopping molecular mechanics model. It represented the observed trend and also gave a fair quantitative agreement with the experiment.
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| 15. |
- Oghbaie, Shabnam, et al.
(author)
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Dissociation of cyclopropane in double ionization continuum
- 2017
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In: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry. - 1463-9076 .- 1463-9084. ; 19:30, s. 19631-19639
-
Journal article (peer-reviewed)abstract
- Dissociative double photoionization of cyclopropane is studied in the inner-valence region using tunable synchrotron radiation. With the aid of ab initio quantum chemical calculations the energies of dication states and their favoured fragmentation pathways are determined. These are compared to the experimental appearance energies of two-body fragmentation processes and to the kinetic energy released upon dissociation. Photon energy dependent state-selective dissociation in the 25-35 eV range is found. Calculations of dissociation pathways suggest that cyclopropane ring-deformation is selectively triggered at certain photon energies. The calculations suggest that initial ring deformation essentially determines the population of different dication states that function as gateways for particular dissociation channels. The measurements show that stepwise ionization processes populate dissociative 3e'(-2) states via ring-opening and Jahn-Teller active states at photon energies below the double-ionization threshold. For energies above the double-ionization threshold the kinematics indicate that double ionization takes place predominantly within the Franck-Condon region populating 3e'(-1) 1e ''(-1) states.
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| 16. |
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| 17. |
- Pihlava, L., et al.
(author)
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Photodissociation dynamics of halogenated aromatic molecules: the case of core-ionized tetrabromothiophene
- 2021
-
In: Physical Chemistry Chemical Physics. - : Royal Society of Chemistry (RSC). - 1463-9076 .- 1463-9084. ; 23:37, s. 21249-21261
-
Journal article (peer-reviewed)abstract
- We studied the gas-phase photodissociation of a fully halogenated aromatic molecule, tetrabromothiophene, upon core-shell ionization by using synchrotron radiation and energy-resolved multiparticle coincidence spectroscopy. Photodynamics was initiated by the selective soft X-ray ionization of three elements - C, S, and Br - leading to the formation of dicationic states by Auger decay. From a detailed study of photodissociation upon Br 3d ionization, we formulate a general fragmentation scheme, where dissociation into neutral fragments and a pair of cations prevails, but dicationic species are also produced. We conclude that dicationic tetrabromothiophene typically undergoes deferred charge separation (with one of the ions being often Br+) that may be followed by secondary dissociation steps, depending on the available internal energy of the parent dication. Observations suggest that the ejection of neutral bromine atoms as the first step of deferred charge separation is a prevailing feature in dicationic dissociation, although sometimes in this step the C-Br bonds appear to remain intact and the thiophene ring is broken instead. Ionization-site-specific effects are observed particularly in doubly charged fragments and as large differences in the yields of the intact parent dication. We interpret these effects, using first-principles calculations and molecular dynamics simulations of core-hole states, as likely caused by the geometry changes during the core-hole lifetime.
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| 18. |
- Pihlava, Lassi, et al.
(author)
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Photodissociation of bromine-substituted nitroimidazole radiosensitizers
- 2023
-
In: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry. - 1463-9076 .- 1463-9084. ; 25:18, s. 13004-13011
-
Journal article (peer-reviewed)abstract
- Heavy elements and some nitroimidazoles both exhibit radiosensitizing properties through different mechanisms. In an effort to see how the overall radiosensitivity might be affected when the two radiosensitizers are combined in the same molecule, we studied the gas-phase photodissociation of two brominated nitroimidazoles and a bromine-free reference sample. Synchrotron radiation was employed to initiate the photodynamics and energy-resolved multiparticle coincidence spectroscopy was used to study the ensuing dissociation. We observed the brominated samples releasing high amounts of potentially radiosensitizing fragments upon dissociation. Since bromination also increases the likelihood of the drug molecule being ionised per a given X-ray dose, we conclude that heavy-element substitution of nitroimidazoles appears to be a viable path towards new, potent radiosensitizer drugs.
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| 19. |
- Ristinmaa Sörensen, Stacey, et al.
(author)
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Workshop on Timing Modes for Low-Emittance Storage Rings
- 2015
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In: Synchrotron Radiation News. - : Informa UK Limited. - 0894-0886.
-
Reports (other academic/artistic)abstract
- A three-day workshop was held in Lund, Sweden, from March 25 to 27, 2015, with a focus on timing modes for low-emittance storage rings. The MAX IV Laboratory, currently under construction in Lund, will provide a 1.5 GeV storage ring for soft X-rays and a 3 GeV storage ring with an ultralow emittance down to 0.2 nm rad for hard X-rays [1]. Both rings are designed to operate with a uniform multibunch filling pattern with a 100 MHz RF system and employ passive harmonic cavities [2] to damp instabilities and increase the Touschek lifetime. For the 3 GeV ring, the harmonic cavities are also required to conserve the ultralow emittance at high bunch charge [3]. The facility will include a short pulse facility delivering 100 fs FWHM X-ray pulses at a repetition rate of 100 Hz.
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| 20. |
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| 21. |
- Sankari, Anna, et al.
(author)
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Non-radiative decay and fragmentation in water molecules after 1a1-14a1 excitation and core ionization studied by electron-energy-resolved electron–ion coincidence spectroscopy
- 2020
-
In: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 152:7
-
Journal article (peer-reviewed)abstract
- In this paper, we examine decay and fragmentation of core-excited and core-ionized water molecules combining quantum chemical calculations and electron-energy-resolved electron–ion coincidence spectroscopy. The experimental technique allows us to connect electronic decay from core-excited states, electronic transitions between ionic states, and dissociation of the molecular ion. To this end, we calculate the minimum energy dissociation path of the core-excited molecule and the potential energy surfaces of the molecular ion. Our measurements highlight the role of ultra-fast nuclear motion in the 1a1-14a1 core-excited molecule in the production of fragment ions. OH+ fragments dominate for spectator Auger decay. Complete atomization after sequential fragmentation is also evident through detection of slow H+ fragments. Additional measurements of the non-resonant Auger decay of the core-ionized molecule (1a1-1) to the lower-energy dication states show that the formation of the OH+ + H+ ion pair dominates, whereas sequential fragmentation OH+ + H+ → O + H+ + H+ is observed for transitions to higher dication states, supporting previous theoretical investigations.
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| 22. |
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| 23. |
- Stråhlman, Christian, et al.
(author)
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A Tandem Time--of--Flight Spectrometer for Negative--Ion/Positive--Ion Coincidence Measurements with Soft X-ray Excitation
- 2016
-
In: Review of Scientific Instruments. - : AIP Publishing. - 1089-7623 .- 0034-6748. ; 87:1
-
Journal article (peer-reviewed)abstract
- We present a newly constructed spectrometer for negative--ion/positive--ion coincidence spectroscopy of gaseous samples. The instrument consists of two time--of--flight ion spectrometers and a magnetic momentum filter for deflection of electrons. The instrument can measure double and triple coincidences between mass--resolved negative and positive ions with high detection efficiency. First results include identification of several negative--ion/positive--ion coincidence channels following inner-shell photoexcitation of sulfur hexaflouride (SF$_6$).
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| 24. |
- Stråhlman, Christian, et al.
(author)
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Angle-resolved time-of-flight spectroscopy applied to multi-bunch operation at MAX-lab: a design study
- 2013
-
In: IOP Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 425
-
Conference paper (peer-reviewed)abstract
- Angle-resolved time-of-flight (ARTOF) spectrometers have found use in a number of applications, including ARPES. However, the fundamental requirement of an external start trigger matching the read-out time of the instrument limits its usability at many storage rings. Hitherto all reported experiments have been performed at storage rings capable of running in single-bunch mode. To eliminate this restriction, we propose a method where a pulsed electronic gate is introduced to allow for ARTOF usage at normal multi-bunch operation of the MAX II storage ring. This paper will show the working principle and outline the design for this technique.
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| 25. |
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| 26. |
- Stråhlman, Christian, et al.
(author)
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Negative- and positive-ion fragmentation of core-excited formic-acid molecules studied with three- and four-ion coincidence spectroscopy
- 2017
-
In: Physical Review A: covering atomic, molecular, and optical physics and quantum information. - : American Physical Society. - 2469-9926 .- 2469-9934. ; 96:2
-
Journal article (peer-reviewed)abstract
- The negative-ion fragmentation of formic acid (HCOOH) is studied with negative- and positive-ion coincidence spectroscopy. We report four-body ionic fragmentation where up to three positive ions are collected in coincidence with one negative ion. We report yields for 21 three-body channels and five four-body channels. More than 80% of all negative-ion fragmentation involves production of O-, and it is dominated by complete dissociation of all molecular bonds. Negative-ion creation is most abundant at high-Rydberg resonances and just above the molecule's core-ionization potentials. The existence of four-body fragmentation channels evidences a strong charge redistribution in the molecule.
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| 27. |
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| 28. |
- Stråhlman, Christian, et al.
(author)
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Negative-Ion/Positive-Ion Coincidence Yields of Core-Excited Water
- 2016
-
In: The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory. - : American Chemical Society (ACS). - 1520-5215. ; 120:32, s. 6389-6393
-
Journal article (peer-reviewed)abstract
- We report yields of mass-resolved negative ions and positive ions measured in coincidence after core-excitation of water molecules. The analysis of negative-ion/positive-ion and negative-ion/positive-ion/positive-ion coincidence events provides new information on pathways leading to negative ion production, enhancing the present understanding of the dissociation processes of the water molecule. Dissociation following (resonant) Auger decay dominates negative ion production, but radiative decay is shown to contribute above the O 1s ionization threshold. A peak in the H-/O+ yield above the O 1s threshold is attributed to decay from doubly excited states.
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| 29. |
- Stråhlman, Christian
(author)
-
On the Challenges for Time-of-Flight Electron Spectroscopy at Storage Rings
- 2014
-
Licentiate thesis (other academic/artistic)abstract
- Time-of-flight (TOF) techniques for energy analysis have been common in electron spectroscopy for many decades. TOF-based electron spectrometers benefit from higher transmission and information rate compared to their main competitor: the hemispherical analyser; the drawback being their lower energy resolution. However, the advent of angle-resolved TOF spectrometers for electron energy analysis challenges this perception. State-of-the-art TOF analysers, such as the Scienta ARTOF, offer energy resolution comparable to the hemispherical analyser resolution, while keeping the high transmission. Electron TOF should therefore be valuable complementary instrumentation at any future high-brilliance storage rings such as MAX IV. TOF instruments demand pulsed light with comparably low repetition rates. At storage rings they often rely on the availability of single bunch modes with lower pulse repetition rates. However, time-sharing limits the beamtime available both for timing based instrumentation and experiments, and for those demanding high intensity. Solutions to allow simultaneous operation are therefore critical for the user community. This thesis explores four classes of solutions: Accelerator adaptations, choppers, instrument gating and coincidence techniques. A review of accelerator adaptations, choppers and coincidence techniques is presented which in particular highlights future opportunities for timing based experiments at MAX IV. With regard to gating, this thesis reports the development of an electronic gate for the ARTOF analyser. It is showed how a pulsed electric potential and a system of transmission meshes can be used to simulate single bunch operation and discard electrons which would be unresolvable in the analyser. One paper shows how a detector gate has been implemented to allow use of the instrument in hybrid mode at BESSY storage ring in Berlin. We show that detection efficiency can be increased more than ten times. A second paper discusses the necessary requirements to build a similar gate for the operation mode of the future MAX~IV rings and outlines some initial experimental results.
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| 30. |
- Stråhlman, Christian, et al.
(author)
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Partners or Counterparts?: Student Involvement in Management and Quality Assurance at Lund University
- 2011
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In: EUA Case Studies. - 9789078997252 ; , s. 64-68
-
Conference paper (peer-reviewed)abstract
- There is an increasing demand from students and their organisations all over Europe for involvement in quality assurance. Today, this demand is met with a wide international understanding that student involvement is a key factor in quality assurance. Student representatives and organisations are involved in the development and execution of quality assurance processes in many higher education institutions. While involvement is desirable, it puts higher demands on student organisations to act professionally. Sweden has a long tradition of student involvement in higher education. Swedish legislation entitles students to representation in all decision-making and preparatory bodies at universities. At Lund University this has evolved into a student partnership model where student representatives have full insight as equal partners in university management. This has been a successful and appreciated model. This paper discusses how the partnership model has evolved, how it is maintained and how the student voice has changed.
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| 31. |
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| 32. |
- Stråhlman, Christian, et al.
(author)
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Preparing the MAX IV storage rings for timing-based experiments
- 2016
-
In: PROCEEDINGS OF THE 12TH INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION – SRI2015. - : Author(s). - 9780735413986 - 9780735413986 ; 1741:1741
-
Conference paper (peer-reviewed)abstract
- Time-resolved experimental techniques are increasingly abundant at storage ring facilities. Recent developments in accelerator technology and beamline instrumentation allow for simultaneous operation of high-intensity and timing-based experiments. The MAX IV facility is a state-of-the-art synchrotron light source in Lund, Sweden, that will come into operation in 2016. As many storage ring facilities are pursuing upgrade programs employing strong-focusing multibend achromats and passive harmonic cavities (HCs) in high-current operation, it is of broad interest to study the accelerator and instrumentation developments required to enable timing-based experiments at such machines. In particular, the use of hybrid filling modes combined with pulse picking by resonant excitation or pseudo single bunch has shown promising results. These methods can be combined with novel beamline instrumentation, such as choppers and instrument gating. In this paper we discuss how these techniques can be implemented and employed at MAX IV.
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| 33. |
- Stråhlman, Christian, 1987-, et al.
(author)
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Selective negative-ion formation from core-valence doubly excited states of the water molecule
- 2018
-
In: Physical Review A: covering atomic, molecular, and optical physics and quantum information. - : American Physical Society. - 2469-9926 .- 2469-9934. ; 98:5
-
Journal article (peer-reviewed)abstract
- This study focuses on the role of negative-ion formation in the decay of core-valence doubly excited water molecules. Combining negative- and positive-ion coincidence measurements with calculated energies of core-valence doubly excited states, we find that O− and H− production is enhanced selectively. In particular, we suggest that O− production is correlated to double occupancy of the antibonding 4a1 virtual orbital, while H− appears at electronic states with double occupancy in 2b2. We also show that H− and O− can be created as a result of electron recapture close to the O 1s ionization potential.
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| 34. |
- Stråhlman, Christian, et al.
(author)
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Studenter som tar ansvar
- 2013
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In: Framtiden börjar nu – antologi för dialog om den svenska högskolan 2030. - 9789197943727 ; , s. 57-61
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Book chapter (pop. science, debate, etc.)
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| 35. |
- Stråhlman, Christian
(author)
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Time-of-Flight Ion and Electron Spectroscopy: Applications and Challenges at Storage Ring Light Sources
- 2016
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Doctoral thesis (other academic/artistic)abstract
- This dissertation contains seven studies exploring novel instrumentation for ion and electron spectroscopy, including their applicability at storage ring light sources. The studies focus on instrumentation to study decay, dynamics and dissociation of photoexcited molecules, and the possibility to host such instruments at MAX~IV. Commissioning of an instrument for negative-ion/positive-ion coincidence spectroscopy is reported and its design considerations are discussed. The instrument allows detection of coincidences between mass-resolved negative and (multiple) positive ions, which is demonstrated in a study on the water molecule. Coincidence yields were measured following soft x-ray excitation below and above the O 1s ionization threshold of H2O. Analysis of such yields enhances the present understanding of the dissociation process of the water molecule and allows, for example, designation of previously unchartered doubly excited states and their decay channels. A second study of energy-resolved Auger electrons and mass-resolved positive ions in coincidence provides new data on the non-radiative decay of core-excited and--ionized water molecules. A study using a novel instrument for mass-resolved analysis of highly excited neutral molecular fragments is reported. Such "high Rydberg" states are associated with electron recapture above the ionization threshold. They can also be reached following resonant Auger decay from core--excited states below threshold. The instrument is utilized in a study on the methane molecule. The advent of high-resolution, high-transmission time-of-flight electron spectrometers sets new opportunities for spectroscopy at MAX IV, provided that the timing constraints of such instruments can be met. This dissertation proposes, based on initial experimental studies and theoretical considerations, that an ultra-high resolution electron coincidence experimental station could be constructed at MAX IV. This proposed station combines strengths of hemispherical analysers and time-of-flight instruments. The unique time-structure of the MAX IV storage rings with 10~ns light pulse separation allows for better performance than at other laboratories. Recent developments in chopper technology and so called pseudo single bunch techniques could open up possibilities to run timing-based instrumentation and experiments with high intensity demands in parallel. This dissertation reviews possible adaptations to MAX IV accelerators and beamlines to allow for future inclusion of timing-based spectroscopic instruments.
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- Stråhlman, Christian, et al.
(author)
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Working together for enhancement-led and voluntary institutional quality audit
- 2013
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Conference paper (peer-reviewed)abstract
- The national QA system in Sweden does not any longer include assessment of the institutions’ internal QA procedures. The Experts Group on Quality at the Swedish Association for Higher Education (SHUF) has proposed and tested how voluntary audits can be performed by the institutions in collaboration, coordinated by SUHF. The audits have quality enhancement as its sole purpose. The audit method focuses on quality management, acknowledging the diversity of institutions and the national context. This paper includes results from pilot studies earlier this year. It is demonstrated how voluntary audits can be valuable as an external QA element in the institutions’ quality management. Using the audit as a voluntary and flexible element allows it to address the specific needs of the institutions and keeps the strain on human and financial resources limited.
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- Thorell, Gabriella, et al.
(author)
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The Swedish riding school : A social arena for young riders
- 2018
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In: Sport in Society. - : Informa UK Limited. - 1743-0437 .- 1743-0445. ; 21:9, s. 1416-1431
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Journal article (peer-reviewed)abstract
- The aim was to explore how young riders experience the riding school. By analysing focus groups interviews, a picture emerged showing that young riders' main motive for participating at riding schools was the social aspects. Riding schools could be characterized through an institutional perspective in which the young riders became internalized and socialized into a stable culture. The young riders identified with the norms and values of the riding instructors through master-apprentice learning. In addition, the results revealed a change in the stable culture since the instructors encouraged social interactions and participation in the community that became central to learning and development. Opportunities to influence and interact were important for the individuals and from a child's rights perspective. Through participation in the community of practice at riding schools, young riders not only learn about riding and horse management but also develop important personal social skills.
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| 40. |
- Wagnsson, Stefan, Docent, 1969-, et al.
(author)
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Nyanlända barns och ungdomars uppfattningar om och upplevelser av föreningsidrotten i Sverige
- 2019
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Reports (other academic/artistic)abstract
- Syftet med studien var att undersöka nyanlända barns och ungdomars uppfattningar om och upplevelser av den svenska föreningsidrotten. Studien har en multi-metod design, där 422 nyanlända barn och ungdomar har besvarat en specialkonstruerad enkät, och 107 har deltagit i fokusgruppintervjuer. Resultaten visar att en fjärdedel av respondenterna deltar i svensk förenings-idrott, närmare en femtedel har slutat föreningsidrotta, medan drygt hälften aldrig har idrottat i en förening i Sverige. Främsta motiven till att förenings-idrotta i Sverige är relaterat till att ha roligt, att det är bra och att det utvecklar det svenska språket. En stor andel av de nyanlända barn och ungdomarna i stu-dien uppger att de tränar eller tävlar i träningsgrupper/lag som är blandat med aktiva från Sverige och andra länder. Av de som för närvarande inte föreningsidrottar uppger drygt hälften att de skulle vilja idrotta i en förening. I övrigt visade deltagarmönstren på att poj-kar deltar i dubbelt så hög utsträckning i föreningsidrott som flickor. Ensam-kommande barn och ungdomar och de som inte har uppehållstillstånd idrottar också i högre utsträckning jämfört med de som anlände tillsammans med sin familj. Studien resultat visade vidare att fotboll, kampsport och basket är de mest ut övade idrotterna i Sverige. Tidigare hade 43 procent utövat någon form av organiserad idrott i hemlandet inom främst fotboll, kampsport och volley-boll. Endast hälften av de som hade idrottat i organiserad form i hemlandet del-tar i föreningsidrott i Sverige. Närmare hälften av nyanlända barn och ungdomar i studien har själva sökt upp och tagit kontakt med idrottsföreningarna och frågat om de får börja idrotta, medan endast 5 procent uppger att de har blivit kontaktade av ledare/föreningar i syfte att locka dem till idrotten. De nyanlända barn och ungdomar som i stu-dien uppgav att de inte idrottar, prioriterar skolan i högre utsträckning, upp-lever sig vara allmänt sämre i idrott, har föräldrar som inte är likna angelägna att deras barn idrottar, och har bristande kunskaper om hur de ska göra för att börja i en förening, jämfört med de som idrottar i en förening. En av de faktorer som stack ut i fokusgruppintervjuerna, och i de öppna svaren i enkäten, var nyanlända barns och ungdomars upplevelser av idrottsföreningar-nas frånvaro/ointresse av att kontakta och försöka värva de nyanlända barn och ungdomar som har en uttalad vilja att börja idrotta i en förening. Andra delar som uppfattades viktiga för nyanlända barns och ungdomars idrottande var att idrottsledaren bör ha en social kompetens och stötta varje individ i ett lag/en träningsgrupp, oavsett vilken kompetens eller tidigare bakgrund individen har. (17) (PDF) Nyanlända barns och ungdomars uppfattningar om och upplevelser av föreningsidrotten i Sverige.Available from: https://www.researchgate.net/publication/335310441_Nyanlanda_barns_och_ungdomars_uppfattningar_om_och_upplevelser_av_foreningsidrotten_i_Sverige [accessed Oct 11 2019].
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