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Photoionization of metastable heliumlike C4+ (1s2s S-3(1)) ions: Precision study of intermediate doubly excited states
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 132018 (English)In: Physical Review A: covering atomic, molecular, and optical physics and quantum information, ISSN 2469-9926, E-ISSN 2469-9934, Vol. 98, no 3, article id 033416Article in journal (Refereed) Published
Abstract [en]

In a joint experimental and theoretical endeavor, photoionization of metastable C4+ (1s2s S-3(1)) ions via intermediate levels with hollow, double-K-vacancy configurations 2s2p, 2s3p, 2p3s, 2p3d, 2s4p, 2p4s, and 2p4d has been investigated. High-resolution photon-ion merged-beams measurements were carried out with the resolving power reaching up to 25 800 which is sufficient to separate the leading fine-structure components of the 2s2p P-3 term. Many-body perturbation theory was employed to determine level-to-level cross sections for K-shell excitation with subsequent autoionization. The resonance energies were calculated with inclusion of electron correlation and radiative contributions. Their uncertainties are estimated to be below +/- 1 meV. Detailed balance confirms the present photoionization cross-section results by comparison with previous dielectronic-recombination measurements. The high accuracy of the theoretical transition energies together with the present experimental results qualify photoabsorption resonances in heliumlike ions as new, greatly improved energy-reference standards at synchrotron radiation facilities.

Place, publisher, year, edition, pages
2018. Vol. 98, no 3, article id 033416
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-161192DOI: 10.1103/PhysRevA.98.033416ISI: 000445594400005OAI: oai:DiVA.org:su-161192DiVA, id: diva2:1260084
Available from: 2018-11-01 Created: 2018-11-01 Last updated: 2018-11-01Bibliographically approved

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