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Title: Alignment effects in two-photon double ionization of H{sub 2} in femtosecond xuv laser pulses

Abstract

Triple-differential cross sections for two-photon double ionization of the aligned hydrogen molecule at the equilibrium distance are presented for a central photon energy of 30 eV. The temporal response of the laser-driven molecule is investigated by solving the time-dependent Schroedinger equation in full dimensionality using two-center elliptical coordinates and a finite-element discrete-variable-representation approach. The molecular orientation is found to have a strong effect on the emission modes of the two correlated photoelectrons. This molecular effect is most noticeable when the molecular axis and the laser polarization vector are oriented parallel to each other. For intermediate cases between the parallel and perpendicular geometries, the dominant emission modes for two-electron ejection oscillate between those for the two extreme cases. The contributions from different ionization channels are also analyzed in detail. Depending on the emission direction of the reference electron, the interference contributions from the various channels can be constructive or destructive at small alignment angles, while they always contribute constructively to the triple-differential cross sections near the perpendicular geometry.

Authors:
;  [1];  [2]
  1. Department of Physics and Astronomy, Drake University, Des Moines, Iowa 50311 (United States)
  2. Office of Cyberinfrastructure, National Science Foundation, Arlington, Virgina 22230 (United States)
Publication Date:
OSTI Identifier:
22068722
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 3; Other Information: (c) 2011 American Institute of Physics; Country of input: Syrian Arab Republic; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; DIFFERENTIAL CROSS SECTIONS; DISTANCE; ELECTRONS; EMISSION; EQUILIBRIUM; EV RANGE 10-100; EXTREME ULTRAVIOLET RADIATION; FINITE ELEMENT METHOD; GEOMETRY; HYDROGEN; INTERFERENCE; IONIZATION; LASERS; MOLECULES; ORIENTATION; PHOTONS; POLARIZATION; PULSES; SCHROEDINGER EQUATION; TIME DEPENDENCE

Citation Formats

Xiaoxu, Guan, Bartschat, Klaus, and Schneider, Barry I. Alignment effects in two-photon double ionization of H{sub 2} in femtosecond xuv laser pulses. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.033403.
Xiaoxu, Guan, Bartschat, Klaus, & Schneider, Barry I. Alignment effects in two-photon double ionization of H{sub 2} in femtosecond xuv laser pulses. United States. https://doi.org/10.1103/PHYSREVA.84.033403
Xiaoxu, Guan, Bartschat, Klaus, and Schneider, Barry I. 2011. "Alignment effects in two-photon double ionization of H{sub 2} in femtosecond xuv laser pulses". United States. https://doi.org/10.1103/PHYSREVA.84.033403.
@article{osti_22068722,
title = {Alignment effects in two-photon double ionization of H{sub 2} in femtosecond xuv laser pulses},
author = {Xiaoxu, Guan and Bartschat, Klaus and Schneider, Barry I},
abstractNote = {Triple-differential cross sections for two-photon double ionization of the aligned hydrogen molecule at the equilibrium distance are presented for a central photon energy of 30 eV. The temporal response of the laser-driven molecule is investigated by solving the time-dependent Schroedinger equation in full dimensionality using two-center elliptical coordinates and a finite-element discrete-variable-representation approach. The molecular orientation is found to have a strong effect on the emission modes of the two correlated photoelectrons. This molecular effect is most noticeable when the molecular axis and the laser polarization vector are oriented parallel to each other. For intermediate cases between the parallel and perpendicular geometries, the dominant emission modes for two-electron ejection oscillate between those for the two extreme cases. The contributions from different ionization channels are also analyzed in detail. Depending on the emission direction of the reference electron, the interference contributions from the various channels can be constructive or destructive at small alignment angles, while they always contribute constructively to the triple-differential cross sections near the perpendicular geometry.},
doi = {10.1103/PHYSREVA.84.033403},
url = {https://www.osti.gov/biblio/22068722}, journal = {Physical Review. A},
issn = {1050-2947},
number = 3,
volume = 84,
place = {United States},
year = {Thu Sep 15 00:00:00 EDT 2011},
month = {Thu Sep 15 00:00:00 EDT 2011}
}