Journal article

Authors list: Müller, A; Hillenbrand, PM; Wang, SX; Schippers, S; Bray, I; Kheifets, AS; Lindroth, E; Reinwardt, S; Martins, M; Seltmann, J; Trinter, F

Publication year: 2025

Journal: Physical review A

Volume number: 111

Issue number: 2

ISSN: 2469-9926

eISSN: 2469-9934

DOI Link: https://doi.org/10.1103/PhysRevA.111.023115

Publisher: American Physical Society

Abstract: 
Within a joint experimental and theoretical research project, double photoionization of the He-like B3+ ion by a single photon was studied in the energy range from approximately 350 to 1160 eV. With the parent-ion beam in the experiment containing both 1s2 1S ground-state (90.9%) and 1s2s 3S metastable B3+ ions (9.1%), two contributions to the apparent single- and double-ionization cross sections, aapp 34 and aapp 35 , respectively, are involved in the measurements. Ratios Y(5+)/Y (4+) of double- over single-ionization yields were experimentally determined. By multiplying the measured ratios by the known cross section a34app, the apparent cross section a app 35 for double ionization was inferred. Using the information thus obtained, the measured yield of B5+ ions produced from hydrogenlike B4+ could also be normalized. The results show good agreement with theoretical benchmark cross sections a45 for single photoionization of B4+. Convergent close-coupling calculations were performed to determine double-photoionization cross sections a35 for B3+(1s2) and B3+(1s2s) ions. The result for the ground state agrees very well with theoretical data obtained previously with an intermediate-energy R-matrix approach. Within the systematic uncertainty of the normalized experimental cross sections, calculated and measured data are in agreement with one another.

Harvard Citation style: Müller, A., Hillenbrand, P., Wang, S., Schippers, S., Bray, I., Kheifets, A., et al. (2025) Direct double ionization of the He-like B3+ ion by a single photon, Physical review A, 111(2), Article 023115. https://doi.org/10.1103/PhysRevA.111.023115

APA Citation style: Müller, A., Hillenbrand, P., Wang, S., Schippers, S., Bray, I., Kheifets, A., Lindroth, E., Reinwardt, S., Martins, M., Seltmann, J., & Trinter, F. (2025). Direct double ionization of the He-like B3+ ion by a single photon. Physical review A. 111(2), Article 023115. https://doi.org/10.1103/PhysRevA.111.023115