| 1. |
- Klimesova, Eva, et al.
(författare)
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A multipurpose end-station for atomic, molecular and optical sciences and coherent diffractive imaging at ELI beamlines
- 2021
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Ingår i: The European Physical Journal Special Topics. - : Springer Nature. - 1951-6355 .- 1951-6401. ; 230:23, s. 4183-4194
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Tidskriftsartikel (refereegranskat)abstract
- We report on the status of a users' end-station, MAC: a Multipurpose station for Atomic, molecular and optical sciences and Coherent diffractive imaging, designed for studies of structure and dynamics of matter in the femtosecond time-domain. MAC is located in the E1 experimental hall on the high harmonic generation (HHG) beamline of the ELI Beamlines facility. The extreme ultraviolet beam from the HHG beamline can be used at the MAC end-station together with a synchronized pump beam (which will cover the NIR/Vis/UV or THz range) for time-resolved experiments on different samples. Sample delivery systems at the MAC end-station include a molecular beam, a source for pure or doped clusters, ultrathin cylindrical or flat liquid jets, and focused beams of substrate-free nanoparticles produced by an electrospray or a gas dynamic virtual nozzle combined with an aerodynamic lens stack. We further present the available detectors: electron/ion time-of-flight and velocity map imaging spectrometers and an X-ray camera, and discuss future upgrades: a magnetic bottle electron spectrometer, production of doped nanodroplets and the planned developments of beam capabilities at the MAC end-station.
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| 2. |
- Krikunova, Maria, et al.
(författare)
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Atomic and molecular systems under intense X-ray radiation
- 2016. - 86
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Ingår i: Ultrafast Dynamics Driven by Intense Light Pulses. - Switzerland : Springer. - 9783319201733 - 9783319201726 ; , s. 319-339
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- The review covers recent progress in the development of X-ray pulse metrology essential for experiments at Free Electron Lasers. The scientific section is focused on time-resolved studies of ionization dynamics of atoms, molecules and (bio-)nanoparticles. We discuss the role of ionization dynamics for high resolution imaging of bio-and bio-like nanoparticles and illustrate the potential for multidirectional imaging of unique non-reproducible samples.
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| 3. |
- Oelze, Tim, et al.
(författare)
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THz streak camera performance for single-shot characterization of XUV pulses with complex temporal structures
- 2020
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Ingår i: Optics Express. - : OPTICAL SOC AMER. - 1094-4087. ; 28:14, s. 20686-20703
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Tidskriftsartikel (refereegranskat)abstract
- The THz-field-driven streak camera has proven to be a powerful diagnostic-technique that enables the shot-to-shot characterization of the duration and the arrival time jitter of free electron laser (FEL) pulses. Here we investigate the performance of three computational approaches capable to determine the duration of FEL pulses with complex temporal structures from single-shot measurements of up to three simultaneously recorded spectra. We use numerically simulated FEL pulses in order to validate the accuracy of the pulse length retrieval in average as well as in a single-shot mode. We discuss requirements for the THz field strength in order to achieve reliable results and compare our numerical study with the analysis of experimental data that were obtained at the FEL in Hamburg - FLASH. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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| 4. |
- Schütte, Bernd, et al.
(författare)
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Autoionization following nanoplasma formation in atomic and molecular clusters
- 2016
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Ingår i: European Physical Journal D. Atomic, Molecular, Optical and Plasma Physics. - : Springer Science and Business Media LLC. - 1434-6060. ; 70:5
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Tidskriftsartikel (refereegranskat)abstract
- Abstract: Nanoplasmas resulting from the ionization of nano-scale particles by intense laser pulses are typically described by quasiclassical models, where electron emission is understood to take place via thermal processes. Recently, we discovered that, following the interaction of intense near-infrared (NIR) laser pulses with molecular oxygen clusters, electron emission from nanoplasmas can also occur from atomic bound states via autoionization [Schütte et al., Phys. Rev. Lett. 114, 123002 (2015)]. Here we extend these studies and demonstrate that the formation and decay of doubly-excited atoms and ions is a very common phenomenon in nanoplasmas. We report on the observation of autoionization involving spin-orbit excited states in molecular oxygen and carbon dioxide clusters as well as in atomic krypton and xenon clusters ionized by intense NIR pulses, for which we find clear bound-state signatures in the electron kinetic energy spectra. By applying terahertz (THz) streaking, we show that the observed autoionization processes take place on a picosecond to nanosecond timescale after the interaction of the NIR laser pulse with the clusters. Graphical abstract: [Figure not available: see fulltext.]
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| 5. |
- Schütte, Bernd, et al.
(författare)
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Slow electrons from intense laser-cluster interactions
- 2016
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Ingår i: International Conference on Ultrafast Phenomena, UP 2016. - 9781943580187
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Konferensbidrag (refereegranskat)abstract
- A surprisingly dominant contribution of slow electrons is observed following NIR strong-field ionization of clusters. This is consistent with highly efficient intra-Rydberg correlated electronic decay processes, from which the emission of low-energy electrons is expected.
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