Photoionization of metastable heliumlike C4+(1s2sS13) ions: Precision study of intermediate doubly excited states

Müller, A.; Lindroth, E.; Bari, S.; Borovik, A.; Hillenbrand, P. -M.; Holste, K.; Indelicato, P.; Kilcoyne, A. L.  D.; Klumpp, S.; Martins, M.; Viefhaus, J.; Wilhelm, P.; Schippers, S.

doi:10.1103/PhysRevA.98.033416

Title: Photoionization of metastable heliumlike $C^{4 +} (1 s 2 s {}^{3}S_{1})$ ions: Precision study of intermediate doubly excited states

Journal Article · Tue Sep 25 00:00:00 EDT 2018 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.98.033416· OSTI ID:1604650

Müller, A. ^[1]; Lindroth, E. ^[2]; Bari, S. ^[3]; Borovik, A. ^[1]; Hillenbrand, P. -M. ^[4]; Holste, K. ^[1]; Indelicato, P. ^[5]; Kilcoyne, A. L. D. ^[6]; Klumpp, S. ^[3]; Martins, M. ^[7]; Viefhaus, J. ^[8]; Wilhelm, P. ^[9]; Schippers, S. ^[1]

Justus-Liebig-Univ., Giessen (Germany)
Alba Nova Univ. Center, Stockholm (Sweden)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Columbia Univ., New York, NY (United States)
Sorbonne Univ., Paris (France)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Univ. Hamburg (Germany)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Helmholtz-Zentrum, Berlin (Germany)
Justus-Liebig-Univ., Giessen (Germany); Max-Planck-Inst. fur Kernphysik, Heidelberg (Germany)

In a joint experimental and theoretical endeavor, photoionization of metastable C⁴⁺(1s2s³S₁) 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 ³P 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. Finally, 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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Bundesministerium fur Bildung und Forschung; European Union (EU); Helmholtz Association; Swedish Research Council (SRC)

Grant/Contract Number:: AC02-05CH11231; 05K10RG1; 05K10GUB; 05K16RG1; 05K16GUV; 654220; EMMI HA-216; 2016-03789

OSTI ID:: 1604650

Journal Information:: Physical Review A, Vol. 98, Issue 3; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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Photoionization and photofragmentation of singly charged positive and negative Sc$_3$N@C$_{80}$ endohedral fullerene ions Mueller, Alfred; Martins, M.; Kilcoyne, A. L. D. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2019-02410	text	January 2019
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Complex scaled relativistic configuration-interaction study of the $LL$ resonances in helium-like ions: from Boron to Argon Zaytsev, V. A.; Maltsev, I. A.; Tupitsyn, I. I. arXiv https://doi.org/10.48550/arxiv.1909.11487	text	January 2019

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Title: Photoionization of metastable heliumlike C 4 + ( 1 s 2 s S 1 3 ) ions: Precision study of intermediate doubly excited states

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Title: Photoionization of metastable heliumlike $C^{4 +} (1 s 2 s {}^{3}S_{1})$ ions: Precision study of intermediate doubly excited states