title: Dissociative Photoionization of Molecular Hydrogen - A Joint Experimental and Theoretical Study of the Electron-Electron Correlations induced by XUV Photoionization and Nuclear Dynamics on IR-Laser Dressed Transition States
creator: Fischer, Andreas
subject: ddc-530
subject: 530 Physics
description: In this thesis, the dissociative single-ionization of molecular hydrogen is investigated in a kinematically complete experiment by employing extreme ultraviolet  attosecond pulse trains and infrared femtosecond laser pulses. Induced by the absorption of a single XUV photon, a pronounced energy-dependent asymmetry of the relative emission direction of the photoelectron and the ion is observed. The asymmetry pattern is explained in terms of an interference of two ionization pathways involving a doubly-excited state. This interpretation is validated by a semi-classical model which only takes the nuclear motion into account. Using this model and the observed asymmetry, it is furthermore possible to disentangle the two dissociation pathways which allows for the determination of the autoionization lifetime of the contributing doubly-excited state as a function of the internuclear distance.  Moreover, using a pump-probe experiment the dissociation dynamics of molecular hydrogen is investigated. A time-delay dependent momentum distribution of the  fragments is observed. With a combined quantum mechanical and semi-classical approach the mechanism giving rise to the observed time-dependence is identfied in terms of an intuitive elevator mechanism.
date: 2015
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/18016/1/thesis_fischer.pdf
identifier: DOI:10.11588/heidok.00018016
identifier: urn:nbn:de:bsz:16-heidok-180165
identifier:   Fischer, Andreas  (2015) Dissociative Photoionization of Molecular Hydrogen - A Joint Experimental and Theoretical Study of the Electron-Electron Correlations induced by XUV Photoionization and Nuclear Dynamics on IR-Laser Dressed Transition States.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/18016/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng