Double Photoionization of Atomic Carbon

Frank L Yip

doi:10.3390/atoms10010023

Abstract

Double photoionization events provide a direct evaluation of electron correlation. The recent focus on few-electron targets continues to reveal the consequences of electron correlation for targets that possess several electrons. We consider the double photoionization of the 2p2 valence electrons of atomic carbon and focus on the first energetically accessible final-state symmetries that originate from coupling the active electrons in 3P configurations, which are doubly ionized by a single photon. Comparison of this process in carbon with neon provides an analogous case for the resulting final-state symmetries within the framework where the ejected electrons are influenced by the remaining bound electrons in a frozen-core approximation. Choosing this symmetry allows for comparison with previous theoretical results for total and energy sharing cross-sections of carbon. Fully differential cross-sections for both carbon and neon are also compared.

Highlights

IntroductionCitation: Yip, F.L. DoublePhotoionization of Atomic Carbon.Atoms 2022, 10, 23. https://doi.org/10.3390/atoms10010023Academic Editors: Klaus Bartschat, Charlotte Froese Fischer and AlexeiN. Grum-GrzhimailoReceived: 22 January 2022Accepted: 10 February 2022Published: 12 February 2022Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Copyright: Licensee MDPI, Basel, Switzerland
We present calculated results from atomic neon, where two of the valence 2p6 electrons are doubly ejected into the continuum, leaving behind a double cation with the 2p4 electrons coupled into 3 P configurations and thereby assuring that the outgoing electrons originated in 3 P initial-state configurations; this provides the ability to compare with the analogous ground-state process in carbon and better understand the consequences of the initial- and final-state symmetries on the resulting angular distributions
The results considered in this work illustrate the dominant impact that the initial-state coupling of the outgoing electrons possesses, along with the final-state symmetries that are accessed by dipole selection rules in single photoabsorption events may have on the resulting angular distributions of the triple-differential cross-section (TDCS) in correlated events

Summary

Introduction

Citation: Yip, F.L. DoublePhotoionization of Atomic Carbon.Atoms 2022, 10, 23. https://doi.org/10.3390/atoms10010023Academic Editors: Klaus Bartschat, Charlotte Froese Fischer and AlexeiN. Grum-GrzhimailoReceived: 22 January 2022Accepted: 10 February 2022Published: 12 February 2022Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Copyright: Licensee MDPI, Basel, Switzerland.

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