Auger spectra following inner-shell ionization of Argon by a Free-Electron Laser

TL;DR

This paper investigates how free-electron laser radiation can be used to retrieve Auger spectra following inner-shell ionization of argon, revealing detailed electron transition information through coincidence measurements.

Contribution

It demonstrates a method to extract Auger spectra of argon ions after inner-shell ionization using FEL radiation and coincidence detection techniques.

Findings

Successfully retrieved Auger spectra of Ar+ and Ar^{2+}

Showed the importance of fine structure in spectral analysis

Demonstrated feasibility of using FEL for Auger spectroscopy

Abstract

We explore the possibility of retrieving Auger spectra with FEL radiation. Using a laser pulse of 260 eV photon energy, we study the interplay of photo-ionization and Auger processes following the initial formation of a 2p inner-shell hole in Ar. Accounting for the fine structure of the ion states we demonstrate how to retrieve the Auger spectrum of $\mathrm{Ar^{+}\rightarrow Ar^{2+}}$. Moreover, considering two electrons in coincidence we also demonstrate how to retrieve the Auger spectrum of $\mathrm{Ar^{2+}\rightarrow Ar^{3+}}$.