skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Multiphoton ionization of H{sub 2}{sup +} in xuv laser pulses

Abstract

We consider the ionization of the hydrogen molecular ion after one-, two-, and three-photon absorption over a large range of photon energies between 9 and 40 eV in the fixed-nuclei approximation. The temporal development of the system is obtained in a fully ab initio time-dependent grid-based approach in prolate spheroidal coordinates. The alignment dependence of the one-photon ionization amplitude is highlighted in the framework of time-dependent perturbation theory. For one-photon ionization as a function of the nuclear separation, the calculations reveal a significant minimum in the ionization probability. The suppressed ionization is attributed to a Cooper-type minimum, which is similar, but not identical, to the cancellation effect observed in photoionization cross sections of some noble-gas atoms. The effect of the nonspherical two-center Coulomb potential is analyzed. For two- and three-photon ionization, the angle-integrated cross sections clearly map out intermediate-state resonances, and the predictions of the current computations agree very well with those from time-independent calculations. The dominant emission modes for two-photon ionization are found to be very similar in both resonance and off-resonance regions.

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:
22068739
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; ABSORPTION; AMPLITUDES; APPROXIMATIONS; ATOMS; COULOMB FIELD; CROSS SECTIONS; EMISSION; EXTREME ULTRAVIOLET RADIATION; HYDROGEN; HYDROGEN IONS 2 PLUS; INTERMEDIATE STATE; LASERS; PERTURBATION THEORY; PHOTOIONIZATION; PHOTONS; PROBABILITY; PULSES; RARE GASES; RESONANCE; TIME DEPENDENCE

Citation Formats

Guan Xiaoxu, Secor, Ethan B., Bartschat, Klaus, and Schneider, Barry I. Multiphoton ionization of H{sub 2}{sup +} in xuv laser pulses. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.033420.
Guan Xiaoxu, Secor, Ethan B., Bartschat, Klaus, & Schneider, Barry I. Multiphoton ionization of H{sub 2}{sup +} in xuv laser pulses. United States. doi:10.1103/PHYSREVA.84.033420.
Guan Xiaoxu, Secor, Ethan B., Bartschat, Klaus, and Schneider, Barry I. Thu . "Multiphoton ionization of H{sub 2}{sup +} in xuv laser pulses". United States. doi:10.1103/PHYSREVA.84.033420.
@article{osti_22068739,
title = {Multiphoton ionization of H{sub 2}{sup +} in xuv laser pulses},
author = {Guan Xiaoxu and Secor, Ethan B. and Bartschat, Klaus and Schneider, Barry I.},
abstractNote = {We consider the ionization of the hydrogen molecular ion after one-, two-, and three-photon absorption over a large range of photon energies between 9 and 40 eV in the fixed-nuclei approximation. The temporal development of the system is obtained in a fully ab initio time-dependent grid-based approach in prolate spheroidal coordinates. The alignment dependence of the one-photon ionization amplitude is highlighted in the framework of time-dependent perturbation theory. For one-photon ionization as a function of the nuclear separation, the calculations reveal a significant minimum in the ionization probability. The suppressed ionization is attributed to a Cooper-type minimum, which is similar, but not identical, to the cancellation effect observed in photoionization cross sections of some noble-gas atoms. The effect of the nonspherical two-center Coulomb potential is analyzed. For two- and three-photon ionization, the angle-integrated cross sections clearly map out intermediate-state resonances, and the predictions of the current computations agree very well with those from time-independent calculations. The dominant emission modes for two-photon ionization are found to be very similar in both resonance and off-resonance regions.},
doi = {10.1103/PHYSREVA.84.033420},
journal = {Physical Review. A},
issn = {1050-2947},
number = 3,
volume = 84,
place = {United States},
year = {2011},
month = {9}
}