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Title: Enhanced ionization of hydrogen molecular ions in an intense laser field via a multiphoton resonance

Abstract

Multiphoton ionization of hydrogen molecular ions in a 480-nm intense laser field is investigated by solving the time-dependent Schroedinger equation numerically in prolate spheroidal coordinates. We discretize space on a generalized pseudospectral grid and propagate the electronic wave function using a second-order split-operator method. By including and excluding the 2psigma{sub u} state in the basis expansion, we confirm that the observed 10-eV peak in a recent experiment [Litvinyuk et al., New J. Phys. 10, 083011 (2008)] comes from the enhanced ionization via three-photon resonant excitation of the molecular ions. By folding the calculated ionization rates with the vibrational density distribution, the kinetic energy release spectra are obtained, which are in reasonable agreement with the experimental measurement. Furthermore, using this enhanced ionization, a pump-probe experiment is suggested to trace the vibrational wave packet.

Authors:
;  [1];  [1]
  1. Institute of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan)
Publication Date:
OSTI Identifier:
21388750
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 81; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevA.81.013408; (c) 2010 The American Physical Society; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; EV RANGE; EXCITATION; GRIDS; HYDROGEN; KINETIC ENERGY; LASER RADIATION; MOLECULAR IONS; MULTI-PHOTON PROCESSES; PHOTOIONIZATION; PHOTONS; RESONANCE; SCHROEDINGER EQUATION; TIME DEPENDENCE; WAVE FUNCTIONS; WAVE PACKETS; BOSONS; CHARGED PARTICLES; DIFFERENTIAL EQUATIONS; ELECTRODES; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; ELEMENTS; ENERGY; ENERGY RANGE; ENERGY-LEVEL TRANSITIONS; EQUATIONS; FUNCTIONS; IONIZATION; IONS; MASSLESS PARTICLES; NONMETALS; PARTIAL DIFFERENTIAL EQUATIONS; RADIATIONS; WAVE EQUATIONS

Citation Formats

Yingjun, Jin, Toshima, Nobuyuki, Xiaomin, Tong, and Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577. Enhanced ionization of hydrogen molecular ions in an intense laser field via a multiphoton resonance. United States: N. p., 2010. Web. doi:10.1103/PHYSREVA.81.013408.
Yingjun, Jin, Toshima, Nobuyuki, Xiaomin, Tong, & Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577. Enhanced ionization of hydrogen molecular ions in an intense laser field via a multiphoton resonance. United States. https://doi.org/10.1103/PHYSREVA.81.013408
Yingjun, Jin, Toshima, Nobuyuki, Xiaomin, Tong, and Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577. Fri . "Enhanced ionization of hydrogen molecular ions in an intense laser field via a multiphoton resonance". United States. https://doi.org/10.1103/PHYSREVA.81.013408.
@article{osti_21388750,
title = {Enhanced ionization of hydrogen molecular ions in an intense laser field via a multiphoton resonance},
author = {Yingjun, Jin and Toshima, Nobuyuki and Xiaomin, Tong and Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577},
abstractNote = {Multiphoton ionization of hydrogen molecular ions in a 480-nm intense laser field is investigated by solving the time-dependent Schroedinger equation numerically in prolate spheroidal coordinates. We discretize space on a generalized pseudospectral grid and propagate the electronic wave function using a second-order split-operator method. By including and excluding the 2psigma{sub u} state in the basis expansion, we confirm that the observed 10-eV peak in a recent experiment [Litvinyuk et al., New J. Phys. 10, 083011 (2008)] comes from the enhanced ionization via three-photon resonant excitation of the molecular ions. By folding the calculated ionization rates with the vibrational density distribution, the kinetic energy release spectra are obtained, which are in reasonable agreement with the experimental measurement. Furthermore, using this enhanced ionization, a pump-probe experiment is suggested to trace the vibrational wave packet.},
doi = {10.1103/PHYSREVA.81.013408},
url = {https://www.osti.gov/biblio/21388750}, journal = {Physical Review. A},
issn = {1050-2947},
number = 1,
volume = 81,
place = {United States},
year = {2010},
month = {1}
}