Above-threshold ionization with highly-charged ions in super-strong laser fields: II. Relativistic Coulomb-corrected strong field approximation

TL;DR

This paper develops a relativistic Coulomb-corrected strong field approximation to analyze spin effects and ionization rates in highly charged ions subjected to super-strong laser fields, extending the theoretical framework of strong field ionization.

Contribution

It introduces a relativistic Coulomb-corrected SFA based on the eikonal-Volkov wave function, providing analytical calculations of ionization rates for highly charged ions in strong laser fields.

Findings

Analytical expressions for differential and total ionization rates.

Retrieval of the relativistic Perelomov-Popov-Terent'ev ionization rate.

Discussion of the physical relevance of different SFA partitions.

Abstract

We develop a relativistic Coulomb-corrected strong field approximation (SFA) for the investigation of spin effects at above-threshold ionization in relativistically strong laser fields with highly charged hydrogen-like ions. The Coulomb-corrected SFA is based on the relativistic eikonal-Volkov wave function describing the ionized electron laser-driven continuum dynamics disturbed by the Coulomb field of the ionic core. The SFA in different partitions of the total Hamiltonian is considered. The formalism is applied for direct ionization of a hydrogen-like system in a strong linearly polarized laser field. The differential and total ionization rates are calculated analytically. The relativistic analogue of the Perelomov-Popov-Terent'ev ionization rate is retrieved within the SFA technique. The physical relevance of the SFA in different partitions is discussed.