Abstract
Single and double ionization of berylliumlike ${\mathrm{C}}^{2+}$ 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 $1{s}^{2}2{s}^{2}\phantom{\rule{0.28em}{0ex}}^{1}S$ ground level and the $1{s}^{2}2s2p\phantom{\rule{0.28em}{0ex}}^{3}P$ metastable levels. A comparison of the experimentally derived cross-section function for photoabsorption by ${\mathrm{C}}^{2+}$ to a model based on previous $R$-matrix calculations shows very satisfying agreement.
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