Relativistic analytical R-matrix (ARM) theory for strong-field ionization
Abstract
The analytical R-matrix (ARM) theory has been known for an efficient description of the Coulomb effects of the atomic core in strong-field ionization in the nonrelativistic regime. We generalize the ARM theory into the relativistic domain aiming at the application to strong-field ionization of highly-charged ions in ultrastrong laser fields. Comparison with the relativistic Coulomb-corrected strong field approximations (SFA) is provided, highlighting the advantages and disadvantages. The weakly relativistic asymptotics and its accordance with the nondipole Coulomb-corrected SFA are examined. As an example of a physical application of the relativistic ARM, the Coulomb enhancement of tunneling ionization probability for highly-charged ions at the cutoff of the direct channel is discussed.
Keywords
Cite
@article{arxiv.2302.01779,
title = {Relativistic analytical R-matrix (ARM) theory for strong-field ionization},
author = {Michael Klaiber and Karen Z. Hatsagortsyan and Christoph H. Keitel},
journal= {arXiv preprint arXiv:2302.01779},
year = {2023}
}