title: Time-resolved Fragmentation of Diiodomethane studied in an XUV Pump-Probe Experiment
creator: Trost, Florian
subject: ddc-530
subject: 530 Physics
description: The dissociation dynamics of diiodomethane molecules (CH2I2) have been investigated in a 97.6 eV XUV-pump XUV-probe measurement at the reaction microscope endstation at the free-electron laser FLASH2. Ionic fragments created by 4d inner-valence ionisation followed by Auger decay have been detected in coincidence, enabling a kinematically complete reconstruction of the dissociation pathways. In the CH2+ + I+ + I+ one-photon absorption channel a concerted three-body breakup and a sequential dissociation via a rotating intermediate CH2I++ ion have been identified. Classical simulations have been performed, and are compared to the data and to `Atom Centered Density Matrix Propagation' (ADMP) calculations conducted by Martín et al. Both types of simulations reproduce different aspects of the observed fragmentation dynamics. In the time-resolved two-photon absorption channels I+++ + CH2I+ and CH2+ + I+++ + I+, charge transfer occurs at short internuclear distances leading to suppression of the I+++ charge state formation. The timescales of charge transfer in the two different dissociation channels have been measured to be 200 +- 11 fs for I+++ + CH2I+ and 119 +- 15 fs for CH2+ + I+++ + I+.
date: 2023
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/33303/1/Dissertation_FlorianTrost.pdf
identifier: DOI:10.11588/heidok.00033303
identifier: urn:nbn:de:bsz:16-heidok-333030
identifier:   Trost, Florian  (2023) Time-resolved Fragmentation of Diiodomethane studied in an XUV Pump-Probe Experiment.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/33303/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng