Near-K-edge single and double photoionization of C2+ ions

Single and double ionization of berylliumlike C2+ by a single photon is investigated in the energy range from 292 to 350 eV in the vicinity of the K-shell single-ionization threshold. Energy resolutions range between 160 meV for overview scans and 11 meV for high-resolution spectroscopy. The experimental cross sections include contributions from the 1s(2)2s(2) S-1 ground level and the 1s(2)2s2p P-3 metastable levels. A comparison of the experimentally derived cross-section function for photoabsorption by C2+ to a model based on previous R-matrix calculations shows very satisfying agreement.

Automated summary

Single and double ionization of berylliumlike C2+ by a single photon in the vicinity of the K-shell single-ionization threshold, in the energy range from 292 to 350 eV, is investigated. The experimental cross sections, with energy resolutions ranging from 160 meV to 11 meV, include contributions from the 1s(2)2s(2) S-1 ground level and the 1s(2)2s2p P-3 metastable levels. A comparison with a model based on previous R-matrix calculations shows very satisfying agreement.