title: Fragmentation Dynamics of Small Molecules upon  Multiple Ionization by X-Ray Free-Electron Laser Pulses
creator: Erk, Benjamin Michael Dieter
subject: ddc-530
subject: 530 Physics
description: The ionization and fragmentation dynamics of small molecules (CH3SeH, C2H5SeH,  CH3I, and ICl) triggered by intense ultrashort soft X-ray pulses delivered by the Linac  Coherent Light Source are investigated employing coincident three-dimensional ion momentum  spectroscopy.  This work aims at investigating the role of the molecular environment in multiple inner-shell photoionization and the accompanying electronic relaxation processes by studying  molecular systems containing a single constituent of high nuclear charge Z, i.e. selenium  or iodine, such that photoabsorption is almost exclusively localized at the core-shells of  these heavy atoms. By comparing the level of ionization for the molecules containing selenium  or iodine with results on isolated krypton and xenon atoms, signatures of efficient  charge redistribution within the molecular environment are observed. Measured kinetic  energies and angular distributions of the ionic fragments in comparison to the outcome  of a simple Coulomb explosion model allow tracking down the evolution of the molecular  geometry, revealing considerable displacement of the nuclei on the time scale of sequential  multiple ionization. The results obtained have considerable implications for coherent  diffractive imaging, providing a direct measure of radiation damage (displacement of nuclei  and electronic rearrangement) on the time scale of the X-ray pulse and the length scale of  the individual atoms.
date: 2013-01
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/14311/1/Erk_PhD.pdf
identifier: DOI:10.11588/heidok.00014311
identifier: urn:nbn:de:bsz:16-heidok-143119
identifier:   Erk, Benjamin Michael Dieter  (2013) Fragmentation Dynamics of Small Molecules upon Multiple Ionization by X-Ray Free-Electron Laser Pulses.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/14311/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng