eprintid: 29307
rev_number: 16
eprint_status: archive
userid: 5652
dir: disk0/00/02/93/07
datestamp: 2021-01-26 14:23:19
lastmod: 2021-01-27 08:22:14
status_changed: 2021-01-26 14:23:19
type: doctoralThesis
metadata_visibility: show
creators_name: Rebholz, Marc Anton Alexander
title: All-XUV pump-probe transient absorption spectroscopy on the dissociation dynamics of small molecules
subjects: ddc-530
divisions: i-130001
divisions: i-741010
divisions: i-851340
adv_faculty: af-13
abstract: In this work, the implementation of an XUV-pump–XUV-probe transient absorp- tion spectroscopy scheme at the free-electron laser facility FLASH in Hamburg is presented. It is applied to the ultrafast dissociation dynamics of the small molecules diiodomethane and oxygen. For the diiodomethane target, the XUV pump pulse enables the resonant site-specific excitation of an iodine 4d electron to an antibonding molecular orbital. The hereby initiated dissociation of the molecule includes a direct, as well as an indirect path through isomeric geometries of the molecular cation. These parallel pathways are traced with the help of simulated absorption spectra and their time constants are extracted via a global fit model. In the case of the oxygen target, dissociation is initiated by the (multiple) ionization of the oxygen molecule. The emergence of absorption resonances of the doubly- charged ionic fragment O2+ is observed in the probe spectrum as a product of the dissociation. The compatibility of the extracted rise times of the fragments with Coulomb explosion is investigated with a simple classical model.
date: 2021
id_scheme: DOI
id_number: 10.11588/heidok.00029307
ppn_swb: 1745749497
own_urn: urn:nbn:de:bsz:16-heidok-293078
date_accepted: 2020-12-16
advisor: HASH(0x55a71846c7a0)
language: eng
bibsort: REBHOLZMARALLXUVPUMP2021
full_text_status: public
place_of_pub: Heidelberg
citation:   Rebholz, Marc Anton Alexander  (2021) All-XUV pump-probe transient absorption spectroscopy on the dissociation dynamics of small molecules.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/29307/1/Dissertation_Rebholz_to_university.pdf