eprintid: 34342
rev_number: 15
eprint_status: archive
userid: 7900
dir: disk0/00/03/43/42
datestamp: 2024-01-26 09:29:13
lastmod: 2024-02-12 13:05:02
status_changed: 2024-01-26 09:29:13
type: doctoralThesis
metadata_visibility: show
creators_name: Borisova, Gergana Dimitrova
title: Controlling two-electron systems in their excited state by an intense laser field: Strong-field ionization of atomic helium & Wave-packet manipulation in molecular hydrogen
subjects: ddc-530
divisions: i-130001
divisions: i-741010
divisions: i-851340
adv_faculty: af-13
abstract: In this work fundamental light–matter interaction is studied in excited-state two-electron systems under the influence of an intense laser field in two respects: First, motivated by the results of a numerical simulation on the role of initial-state electron correlation for the ionization process, strong-field ionization out of selectively prepared doubly excited states (DESs) in helium is studied in a two-colour extreme ultraviolet (XUV)–infrared (IR) experiment using a reaction microscope (REMI). Detected recoil-ion and photoelectron momentum distributions help to identify a variety of different IR-induced ionization pathways for both single and double ionization out of different DESs as the initial state for strong-field interaction. Turning the focus from the atomic to the molecular two-electron system, in the second study, a novel all-optical approach enables visualisation of the dynamics of a vibrational wave packet in an electronically excited state of neutral H_2 through molecular self-probing by the ground state encoded in the reconstructed time-dependent dipole response of the excited system from XUV spectroscopy data. In a pump–control scheme, an additional interaction with a 5-fs near-infrared (NIR) pulse of adjustable intensity modifies the vibrational wave-packet revival. The adoption of an impulsive control mechanism together with state-resolved extraction of the accumulated strong-field induced phases leading to the observed revival shift brings access to state-dependent polarizability of different vibronic states in the excited wave packet. In future, both experimental approaches can be applied to multi-electron systems to study and control correlation in specifically prepared excited quantum systems.
date: 2024
id_scheme: DOI
id_number: 10.11588/heidok.00034342
ppn_swb: 1880305984
own_urn: urn:nbn:de:bsz:16-heidok-343425
date_accepted: 2024-01-16
advisor: HASH(0x55fc36d0dce0)
language: eng
bibsort: BORISOVAGECONTROLLIN2024
full_text_status: public
place_of_pub: Heidelberg
citation:   Borisova, Gergana Dimitrova  (2024) Controlling two-electron systems in their excited state by an intense laser field: Strong-field ionization of atomic helium & Wave-packet manipulation in molecular hydrogen.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/34342/1/Dissertation_GerganaDBorisova.pdf