Relativistic photoionization of H isoelectronic series including plasma shielding effects

TL;DR

This study investigates how plasma shielding and relativistic effects influence the photoionization of hydrogen-like ions, providing detailed calculations of cross sections and electron emission parameters in plasma environments.

Contribution

It introduces a non-perturbative relativistic approach to analyze photoionization in plasma-shielded Coulomb potentials for hydrogenic ions.

Findings

Photoionization cross sections agree with existing theories.

Relativistic and plasma shielding effects significantly alter ionization parameters.

Multipole contributions are important at high photon energies.

Abstract

With plasma shielding effects of the Debye-H\"uckel model, we investigate the relativistic photoionization processes of H, Nb$^{40+}$ and Pb$^{81+}$ plasmas in the H-isoelectronic series. The shielded nuclear potential of Yukawa-type experienced by the electron is parameterized by Debye-length $D$. To account for relativistic effects non- perturbatively, we solve the Dirac equation for the bound as well as continuum wavefunctions. Contributions from multipole fields are calculated for high incident photon energies, while the angular distribution and spin polarization parameters of photoelectrons are provided in the electric-dipole approximation. Our results of photoionization cross sections for the H plasma agree with other available theoretical calculations. The interplay between the relativistic and plasma shielding effects on the photoionization parameters is also studied. \keywords{Photoionization, Multipole effect, Debye plasma, Hydrogen atom, Hydrogen-like ions