Atomic photoionization cross-sections beyond the electric dipole approximation

Abstract

A methodology is developed to compute photoionization cross-sections beyond the electric dipole (BED) approximation from response theory, using Gaussian type orbitals and plane waves for the initial and final states, respectively. The methodology is applied to compute photoionization cross-sections of atoms and ions from the first four rows of the Periodic Table. Analysing the error due to the plane wave description of the photoelectron, we find kinetic energy and concomitant photon energy thresholds above which the plane wave approximation becomes applicable. The correction introduced by going beyond the electric dipole approximation increases with photon energy and depends on the spatial extension of the initial state. In general, the corrections are below 10% for most elements, at a photon energy reaching up to 12 keV.

arXiv comment29 pages, 7 figures

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Cited by in corpus (3)

• Beyond the electric-dipole approximation in simulations of X-ray absorption spectroscopy: Lessons from relativistic theory
• Recoil-Induced Asymmetry of Nondipole Molecular Frame Photoelectron Angular Distributions in the Hard X-ray Regime
• Photoionization and core resonances from range-separated density-functional theory: General formalism and example of the beryllium atom