eprintid: 19644
rev_number: 11
eprint_status: archive
userid: 2114
dir: disk0/00/01/96/44
datestamp: 2015-10-28 08:46:10
lastmod: 2015-10-28 11:58:36
status_changed: 2015-10-28 08:46:10
type: doctoralThesis
metadata_visibility: show
creators_name: Cörlin, Philipp
title: Tracing ultra-fast molecular dynamics in O_2^+ and N_2^+
with XUV–IR pump–probe experiments
subjects: ddc-530
divisions: i-851340
adv_faculty: af-13
abstract: Within this thesis, molecular dynamics of diatomic molecules is studied using the XUV–IR pump–probe technique. Here, a single extreme ultraviolet (XUV) photon created by high-harmonic generation ionizes the diatomic target molecule. The initiated dynamics is probed after a variable time delay by an ultrashort (12 fs) infrared (IR) laser pulse. The 3-dimensional momenta of all charged fragments are measured using a reaction microscope.
In an experiment on O_2, a nuclear wave-packet oscillation is observed on the binding potential-energy curve (PEC) of the O_2^+(a ^4Π_u) electronic state. By comparing
simulated results with experimental data, theoretically predicted PECs are tested. The experimental results are best reproduced if the wave packet is propagated on a
Morse potential adjusted to the experimental data. This demonstrates the sensitivity of our method and its ability to predict accurate PECs from the measured wave-packet
evolution.
In an N2 experiment, the pump–probe delay dependent yield of stable N_2^+ is observed. It is interpreted as a sequential double ionization via a highly excited antibonding cationic state. The dissociation of the intermediate state is temporally resolved and can be interrupted by multi-photon ionization with the IR pulse within ≈ 15 fs after XUV ionization.
date: 2015
id_scheme: DOI
id_number: 10.11588/heidok.00019644
ppn_swb: 1658744624
own_urn: urn:nbn:de:bsz:16-heidok-196449
date_accepted: 2015-10-14
advisor: HASH(0x55d997c50990)
language: eng
bibsort: CORLINPHILTRACINGULT2015
full_text_status: public
citation:   Cörlin, Philipp  (2015) Tracing ultra-fast molecular dynamics in O_2^+ and N_2^+ with XUV–IR pump–probe experiments.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/19644/1/PHD_thesis_philipp_coerlin_submitted.pdf