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

Title: Electron angular distribution in resonance-enhanced two-photon ionization of H{sub 2}{sup +} by ultrashort laser pulses

Abstract

We present a theoretical study of the electron angular distribution produced in resonance enhanced two-photon ionization of the H{sub 2}{sup +} molecular ion using ultrashort laser pulses. The method consists in solving the time dependent Schroedinger equation and includes all electronic and vibrational degrees of freedom. Differential (in proton energy and electron emission solid angle) ionization probabilities have been evaluated for various photon energies, laser intensities, and pulse durations. We show that (1+1) resonance-enhanced multiphoton ionization (REMPI) leads to angular distributions significantly different from those produced in direct two-photon ionization. The REMPI process is observed even at photon energies not matching the energy difference between two electronic states in a perfect vertical transition. Interestingly, there is no trace of REMPI effects in the electron angular distribution when the fully differential probabilities are integrated over proton energy.

Authors:
; ; ;  [1]
  1. Departamento de Quimica C-9, Universidad Autonoma de Madrid, 28049 Madrid (Spain)
Publication Date:
OSTI Identifier:
20982367
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.75.033419; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ANGULAR DISTRIBUTION; DEGREES OF FREEDOM; ELECTRON EMISSION; ELECTRONS; HYDROGEN IONS 2 PLUS; LASER RADIATION; MOLECULAR IONS; MULTI-PHOTON PROCESSES; PHOTOIONIZATION; PHOTON-MOLECULE COLLISIONS; PHOTONS; PROBABILITY; PROTONS; PULSES; RESONANCE; SCHROEDINGER EQUATION; SOLIDS; TIME DEPENDENCE; VIBRATIONAL STATES

Citation Formats

Selstoe, S., Palacios, A., Fernandez, J., and Martin, F.. Electron angular distribution in resonance-enhanced two-photon ionization of H{sub 2}{sup +} by ultrashort laser pulses. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.75.033419.
Selstoe, S., Palacios, A., Fernandez, J., & Martin, F.. Electron angular distribution in resonance-enhanced two-photon ionization of H{sub 2}{sup +} by ultrashort laser pulses. United States. doi:10.1103/PHYSREVA.75.033419.
Selstoe, S., Palacios, A., Fernandez, J., and Martin, F.. Thu . "Electron angular distribution in resonance-enhanced two-photon ionization of H{sub 2}{sup +} by ultrashort laser pulses". United States. doi:10.1103/PHYSREVA.75.033419.
@article{osti_20982367,
title = {Electron angular distribution in resonance-enhanced two-photon ionization of H{sub 2}{sup +} by ultrashort laser pulses},
author = {Selstoe, S. and Palacios, A. and Fernandez, J. and Martin, F.},
abstractNote = {We present a theoretical study of the electron angular distribution produced in resonance enhanced two-photon ionization of the H{sub 2}{sup +} molecular ion using ultrashort laser pulses. The method consists in solving the time dependent Schroedinger equation and includes all electronic and vibrational degrees of freedom. Differential (in proton energy and electron emission solid angle) ionization probabilities have been evaluated for various photon energies, laser intensities, and pulse durations. We show that (1+1) resonance-enhanced multiphoton ionization (REMPI) leads to angular distributions significantly different from those produced in direct two-photon ionization. The REMPI process is observed even at photon energies not matching the energy difference between two electronic states in a perfect vertical transition. Interestingly, there is no trace of REMPI effects in the electron angular distribution when the fully differential probabilities are integrated over proton energy.},
doi = {10.1103/PHYSREVA.75.033419},
journal = {Physical Review. A},
number = 3,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}