Journalartikel

Jahr der Veröffentlichung: 2018

Zeitschrift: Physical review A

Bandnummer: 98

Heftnummer: 3

ISSN: 2469-9926

eISSN: 2469-9934

Open Access Status: Green

DOI Link: https://doi.org/10.1103/PhysRevA.98.033416

Verlag: American Physical Society

Abstract: 
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.

Harvard-Zitierstil: Mueller, A., Lindroth, E., Bari, S., Borovik, A., Hillenbrand, P., Holste, K., et al. (2018) Photoionization of metastable heliumlike C⁴⁺ (1s2s ³S₁) ions: Precision study of intermediate doubly excited states, Physical review A, 98(3), Article 033416. https://doi.org/10.1103/PhysRevA.98.033416

APA-Zitierstil: Mueller, A., Lindroth, E., Bari, S., Borovik, A., Hillenbrand, P., Holste, K., Indelicato, P., Kilcoyne, A., Klumpp, S., Martins, M., Viefhaus, J., Wilhelm, P., & Schippers, S. (2018). Photoionization of metastable heliumlike C⁴⁺ (1s2s ³S₁) ions: Precision study of intermediate doubly excited states. Physical review A. 98(3), Article 033416. https://doi.org/10.1103/PhysRevA.98.033416