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

Journal Article · Thu Sep 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.033403· OSTI ID:22068722

Xiaoxu, Guan; Bartschat, Klaus ^[1]; Schneider, Barry I ^[2]

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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)

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.

• OSTI ID: 22068722
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 84; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

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