Inner shell alignment of atoms in photon impact ionization

Abstract

The ionization of an atom can result in alignment of the residual ion. In the present work alignment studies are made for some of the high Z elements using different approaches. The theoretical values of the alignment parameter (A2) have been calculated by using the non-relativistic dipole approximation in a point Coulomb potential and analytical perturbation theory in a screened Coulomb potential. Empirical alignment evaluations are done by interpolating experimental L x-ray fluorescence cross-sections along with radiative decay rates. The alignment results are further compared with available theoretical and experimental measurements.