Spin-flip processes and nondipole effects in above-threshold ionization of hydrogen in ultrastrong laser fields

Spin-flip processes and nondipole effects in above-threshold ionization of hydrogen in... We consider above-threshold ionization of hydrogen atoms in ultrastrong laser fields. We use a time-dependent Dirac equation as a calculational tool. This framework allows one to include relativistic effects such as nondipole effects, effects of the relativistic kinematics, and electron spin effects. Inclusion of the spin effects allows one to consider the spin-flip process accompanying above-threshold ionization. We present and discuss electron momenta distributions for ionization processes with and without spin flips. Electron momenta distributions for the ionization process without a spin flip show a gradual increase of the role of the nondipole effects with increasing electric field. Electron spectra for the spin-flip ionization exhibit cusplike singularities, and the absence of features (such as the presence of dips) in the case of the ionization without a spin flip. We explain these features by invoking perturbation theory arguments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review A American Physical Society (APS)

Spin-flip processes and nondipole effects in above-threshold ionization of hydrogen in ultrastrong laser fields

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Spin-flip processes and nondipole effects in above-threshold ionization of hydrogen in ultrastrong laser fields

Abstract

We consider above-threshold ionization of hydrogen atoms in ultrastrong laser fields. We use a time-dependent Dirac equation as a calculational tool. This framework allows one to include relativistic effects such as nondipole effects, effects of the relativistic kinematics, and electron spin effects. Inclusion of the spin effects allows one to consider the spin-flip process accompanying above-threshold ionization. We present and discuss electron momenta distributions for ionization processes with and without spin flips. Electron momenta distributions for the ionization process without a spin flip show a gradual increase of the role of the nondipole effects with increasing electric field. Electron spectra for the spin-flip ionization exhibit cusplike singularities, and the absence of features (such as the presence of dips) in the case of the ionization without a spin flip. We explain these features by invoking perturbation theory arguments.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1050-2947
eISSN
1094-1622
D.O.I.
10.1103/PhysRevA.96.013419
Publisher site
See Article on Publisher Site

Abstract

We consider above-threshold ionization of hydrogen atoms in ultrastrong laser fields. We use a time-dependent Dirac equation as a calculational tool. This framework allows one to include relativistic effects such as nondipole effects, effects of the relativistic kinematics, and electron spin effects. Inclusion of the spin effects allows one to consider the spin-flip process accompanying above-threshold ionization. We present and discuss electron momenta distributions for ionization processes with and without spin flips. Electron momenta distributions for the ionization process without a spin flip show a gradual increase of the role of the nondipole effects with increasing electric field. Electron spectra for the spin-flip ionization exhibit cusplike singularities, and the absence of features (such as the presence of dips) in the case of the ionization without a spin flip. We explain these features by invoking perturbation theory arguments.

Journal

Physical Review AAmerican Physical Society (APS)

Published: Jul 20, 2017

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