eprintid: 17103
rev_number: 14
eprint_status: archive
userid: 1253
dir: disk0/00/01/71/03
datestamp: 2014-07-07 07:57:34
lastmod: 2015-01-27 17:04:38
status_changed: 2014-07-07 07:57:34
type: doctoralThesis
metadata_visibility: show
creators_name: Boll, Rebecca
title: Imaging Molecular Structure with Photoelectron Diffraction
subjects: 530
divisions: 851340
adv_faculty: af-13
abstract: The possibility to study the structure of polyatomic gas-phase molecules by photoelectron diffraction is investigated with the goal of developing a method capable of imaging ultrafast photochemical reactions with femtosecond temporal and sub-Angström spatial resolution. The fluorine 1s-level of adiabatically laser-aligned 1-ethynyl-4-fluorobenzene (C8H5F) molecules was ionized by X-ray pulses from the Linac Coherent Light Source Free-Electron Laser, and the angular distributions of photoelectrons with kinetic energies between 30 and 60 eV  were recorded by velocity map imaging. Comparison with density functional theory calculations allows relating the measured distributions to the molecular structure. The results of an IR-pump, X-ray-probe experiment on aligned 1,4-dibromobenzene (C6H4Br2)molecules are presented to explore the potential of photoelectron diffraction for
time-resolved imaging. The influence of the alignment laser pulse on the pumping and probing step is discussed. Laser-alignment is contrasted with determination of the molecular orientation by photoelectron-photoion coincidences for an exemplary data set on 1-ethynyl-4-fluorobenzene molecules recorded at the PETRA III synchrotron. Both methods are evaluated with respect to their applicability to record
time-dependent snapshots of molecular structure. The results obtained in this work indicate possible future avenues for investigating ultrafast molecular dynamics using
X-ray Free-Electron Lasers.
date: 2014
id_scheme: DOI
id_number: 10.11588/heidok.00017103
ppn_swb: 1654678546
own_urn: urn:nbn:de:bsz:16-heidok-171030
date_accepted: 2014-07-02
advisor: HASH(0x564e1c413f00)
language: eng
bibsort: BOLLREBECCIMAGINGMOL2014
full_text_status: public
place_of_pub: Heidelberg
citation:   Boll, Rebecca  (2014) Imaging Molecular Structure with Photoelectron Diffraction.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/17103/2/Dissertation_Boll.pdf