TY - JOUR

T1 - Multiphoton Ionization of One-Electron Relativistic Diatomic Quasimolecules in Strong Laser Fields

AU - Telnov, Dmitry A.

AU - Krapivin, Dmitry A.

AU - Heslar, John

AU - Chu, Shih I.

PY - 2018/10/11

Y1 - 2018/10/11

N2 - 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 1-92 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. For higher frequencies, the interaction with the field is described beyond the dipole approximation. Nondipole effects in the ionization probability are discussed.

AB - 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 1-92 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. For higher frequencies, the interaction with the field is described beyond the dipole approximation. Nondipole effects in the ionization probability are discussed.

KW - ORDER HARMONIC-GENERATION

KW - DIRAC-EQUATION

KW - BASIS-SET

KW - ATOMS

KW - SYSTEMS

UR - http://www.scopus.com/inward/record.url?scp=85054418561&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/multiphoton-ionization-oneelectron-relativistic-diatomic-quasimolecules-strong-laser-fields

U2 - 10.1021/acs.jpca.8b07463

DO - 10.1021/acs.jpca.8b07463

M3 - Article

AN - SCOPUS:85054418561

VL - 122

SP - 8026

EP - 8036

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

SN - 1520-6106

IS - 40

ER -