Ab initio investigation of the Auger spectra of methane, ethane, ethylene, and acetylene

14 March 2023, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

We present an ab initio computational study of the Auger spectra of methane, ethane, ethylene, and acetylene. Auger spectroscopy is a established technique to probe the electronic structure of molecules and exploits the Auger-Meitner effect that coreionized states produced by X-ray irradiation undergo. We compute partial decay widths for the relevant decay channels using coupled-cluster theory with single and double substitutions (CCSD) and equation-of-motion-CCSD theory combined with complex-scaled basis functions and Feshbach-Fano projection. We generate Auger spectra from these partial widths and draw conclusions about the strength of particular decay channels and trends between the four molecules. A connection to experimental results about fragmentation pathways of the electronic states produced by Auger decay is also made.

Keywords

Auger spectroscopy
X rays
electronic resonances
non-Hermitian quantum chemistry

Supplementary materials

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Description
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Supporting Information
Description
Molecular structures, basis sets, partial decay widths, data used to generate figures in the manuscript
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