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X-ray Absorption an...
X-ray Absorption and Fragmentationas Initial Steps of Radiation Damage in Free Organic Molecules and Nanoparticles
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- Abid, Abdul Rahman (författare)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Patanen, Minna, Associate Professor (preses)
- aNano and Molecular Systems Research Unit, Faculty of Science, University of Oulu, Finland
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- Björneholm, Olle, Professor (preses)
- Uppsala universitet,Energimaterialens fysik
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- Nikkinen, Juha (preses)
- University of Oulu, Oulu, Finland
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- Nahon, Laurent, Dr. (opponent)
- Synchrotron SOLEIL, Saint-Aubin, France
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(creator_code:org_t)
- ISBN 9789526228846
- Oulu, Finland : University of Oulu, 2021
- Engelska 94 s.
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Serie: REPORT SERIES IN PHYSICAL SCIENCES, 1239-4327
- Relaterad länk:
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Abstract
Ämnesord
Stäng
- Understanding the molecular radiation damage is crucial in radiobiology, molecular physics, and atmospheric science. In this thesis, the initial steps of radiation damage of anhydrous gas-phase molecules and hydrated nanoparticles were studied using synchrotron radiation based electron-ion coincidence spectroscopy and X-ray absorption spectroscopy under vacuum conditions. Electron - ion coincidence spectroscopy was used to study the photofragmentation and molecular dynamics of the isolated gas-phase molecules. In addition to the photofragmentation of the gas-phase molecules, the effect of the initial ionization site, initial molecular geometry, and the intramolecular chemical environment has been studied. In avobenzone, core ionization leads to massive fragmentation, with a slight site-selectivity concerning fragment production. In ortho-aminobenzoic acid, core ionization leads to the production of a hydronium ion, indicating that the importance of functional group's position for double intramolecular hydrogen transfer. X-ray absorption spectroscopy was used to probe hydrated nanoparticles prepared at different relative humidities. In hydrated inorganic and mixed inorganic-organic nanoparticles, water is present in a liquid-like state. With different ranges of relative humidity, the primary hydration layers of the hydrated nanoparticles stays the same. In mixed nanoparticles, there is evidence for interaction between the included organic biomolecule with the inorganic and/or water molecules.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Nyckelord
- Coincidence spectroscopy
- PEPI(PI)CO
- electron spectroscopy
- X-ray absorption spectroscopy
- mass spectrometry
- photodissociation
- gas-phase
- liquids
- nanoparticles
- charge transfer
- synchrotron radiation
- Fysik
- Physics
- Physics with spec. in Atomic, Molecular and Condensed Matter Physics
- Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik
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