Excitation of K-shell electrons by electron impact

TL;DR

This paper derives a universal scaling law for electron-impact excitation cross sections of $2s$ states in hydrogen- and helium-like multicharged ions, focusing on near-threshold energies using non-relativistic perturbation theory.

Contribution

It introduces a parametric relationship linking excitation cross sections across multicharged ions with varying electron counts, within a non-relativistic framework.

Findings

Universal scaling behavior established for excitation cross sections.

Near-threshold energy domain analyzed with emphasis on one-photon exchange.

Parametric relationship between different multicharged ions derived.

Abstract

The universal scaling behavior for the electron-impact excitation cross sections of the $2s$ states of hydrogen- and helium-like multicharged ions is deduced. The study is performed within the framework of non-relativistic perturbation theory, taking into account the one-photon exchange diagrams. Special emphasis is laid on the near-threshold energy domain. The parametrical relationship between the cross sections for excitation of multicharged ions with different number of electrons is established.