Relativistic analytical R-matrix theory for strong-field ionization

Klaiber, Michael; Hatsagortsyan, Karen Zaven; Keitel, Christoph H.

doi:10.1103/PhysRevA.107.023107

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Relativistic analytical R-matrix theory for strong-field ionization

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Klaiber, Michael
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Hatsagortsyan, Karen Zaven
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Keitel, Christoph H.
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Citation

Klaiber, M., Hatsagortsyan, K. Z., & Keitel, C. H. (2023). Relativistic analytical R-matrix theory for strong-field ionization. Physical Review A, 107(2): 023107. doi:10.1103/PhysRevA.107.023107.

Cite as: https://hdl.handle.net/21.11116/0000-000C-A840-E

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.