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

Journal Article · Mon Sep 17 00:00:00 EDT 2018 · Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory

DOI:https://doi.org/10.1021/acs.jpca.8b07463· OSTI ID:1470990

Telnov, Dmitry A. ^[1]; Krapivin, Dmitry A. ^[1]; Heslar, John Thomas ^[2]; Chu, Shih-I ^[2]

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1. St. Petersburg State Univ., St. Petersburg (Russia). Dept. of Physics
2. National Taiwan Univ., Taipei (Taiwan). Dept. of Physics

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.

• Research Organization: Univ. of Kansas, Lawrence, KS (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
• Grant/Contract Number: FG02-04ER15504
• OSTI ID: 1470990
• Journal Information: Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Vol. 122, Issue 40; ISSN 1089-5639
• Publisher: American Chemical Society
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY