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Title: Multiphoton Ionization of One-Electron Relativistic Diatomic Quasimolecules in Strong Laser Fields

Abstract

We perform a theoretical and computational study of relativistic one-electron homonuclear diatomic quasimolecules subject to strong electromagnetic fields linearly polarized along the molecular axis. Several quasimolecules with the nuclear charges 1 to 92 and appropriately scaled internuclear distances and field parameters are used in the calculations. The time-dependent Dirac equation is solved with the help of the generalized pseudospectral method in prolate spheroidal coordinates. We have found that employing this coordinate system makes it possible to avoid emergence of spurious states, which usually show up when solving the Dirac equation numerically. For lower carrier frequencies, interaction with the driving field is described within the dipole approximation. Relativistic effects in the multiphoton ionization probabilities are investigated with respect to the internuclear distance in the quasimolecule. In conclusion, for higher frequencies, the interaction with the field is described beyond the dipole approximation. Nondipole effects in the ionization probability are discussed.

Authors:
 [1];  [1];  [2];  [2]
  1. St. Petersburg State Univ., St. Petersburg (Russia). Dept. of Physics
  2. National Taiwan Univ., Taipei (Taiwan). Dept. of Physics
Publication Date:
Research Org.:
Univ. of Kansas, Lawrence, KS (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
OSTI Identifier:
1470990
Grant/Contract Number:  
FG02-04ER15504
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory
Additional Journal Information:
Journal Volume: 122; Journal Issue: 40; Journal ID: ISSN 1089-5639
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Telnov, Dmitry A., Krapivin, Dmitry A., Heslar, John Thomas, and Chu, Shih-I. Multiphoton Ionization of One-Electron Relativistic Diatomic Quasimolecules in Strong Laser Fields. United States: N. p., 2018. Web. doi:10.1021/acs.jpca.8b07463.
Telnov, Dmitry A., Krapivin, Dmitry A., Heslar, John Thomas, & Chu, Shih-I. Multiphoton Ionization of One-Electron Relativistic Diatomic Quasimolecules in Strong Laser Fields. United States. doi:10.1021/acs.jpca.8b07463.
Telnov, Dmitry A., Krapivin, Dmitry A., Heslar, John Thomas, and Chu, Shih-I. Mon . "Multiphoton Ionization of One-Electron Relativistic Diatomic Quasimolecules in Strong Laser Fields". United States. doi:10.1021/acs.jpca.8b07463. https://www.osti.gov/servlets/purl/1470990.
@article{osti_1470990,
title = {Multiphoton Ionization of One-Electron Relativistic Diatomic Quasimolecules in Strong Laser Fields},
author = {Telnov, Dmitry A. and Krapivin, Dmitry A. and Heslar, John Thomas and Chu, Shih-I},
abstractNote = {We perform a theoretical and computational study of relativistic one-electron homonuclear diatomic quasimolecules subject to strong electromagnetic fields linearly polarized along the molecular axis. Several quasimolecules with the nuclear charges 1 to 92 and appropriately scaled internuclear distances and field parameters are used in the calculations. The time-dependent Dirac equation is solved with the help of the generalized pseudospectral method in prolate spheroidal coordinates. We have found that employing this coordinate system makes it possible to avoid emergence of spurious states, which usually show up when solving the Dirac equation numerically. For lower carrier frequencies, interaction with the driving field is described within the dipole approximation. Relativistic effects in the multiphoton ionization probabilities are investigated with respect to the internuclear distance in the quasimolecule. In conclusion, for higher frequencies, the interaction with the field is described beyond the dipole approximation. Nondipole effects in the ionization probability are discussed.},
doi = {10.1021/acs.jpca.8b07463},
journal = {Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory},
number = 40,
volume = 122,
place = {United States},
year = {2018},
month = {9}
}

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