Journal article

Publication year: 2021

Journal: Physical review A

Volume number: 103

Issue number: 3

ISSN: 2469-9926

eISSN: 2469-9934

Open access status: Green

DOI Link: https://doi.org/10.1103/PhysRevA.103.L031101

Publisher: American Physical Society

Abstract: 
Direct double ionization of the Ar+(3p(-1)) ion by a single photon is investigated both experimentally and theoretically. The photon-ion merged-beams technique was employed at the Advanced Light Source in Berkeley, USA, to measure absolute cross sections in the energy range from 60 to 150 eV. In this range, three contributions to the double ionization of Ar+ are to be expected: the removal of two 3p electrons, of a 3s and a 3p electron, and of two 3s electrons. Among the possible mechanisms leading to double ionization, the TS1 (two-step one) process dominates in the near-threshold region. In TS1, a photoelectron is ejected and, on its way out, knocks out a secondary electron. This two-step mechanism is treated theoretically by multiplying the calculated cross section for direct single photoionization of a given subshell with the calculated (e, 2e) ionization probability for the ejected photoelectron to knock off a secondary electron. The calculated cross section is in very good agreement with the experiment.

Harvard Citation style: Müller, A., Kilcoyne, A., Phaneuf, R., Holste, K., Schippers, S. and Kheifets, A. (2021) Direct double ionization of the Ar+ M shell by a single photon, Physical review A, 103(3), Article L031101. https://doi.org/10.1103/PhysRevA.103.L031101

APA Citation style: Müller, A., Kilcoyne, A., Phaneuf, R., Holste, K., Schippers, S., & Kheifets, A. (2021). Direct double ionization of the Ar+ M shell by a single photon. Physical review A. 103(3), Article L031101. https://doi.org/10.1103/PhysRevA.103.L031101