K-shell photoionization of ground-state Li-like carbon ions [C${}^{3+}$]: experiment, theory and comparison with time-reversed photorecombination

Abstract

Absolute cross sections for the K-shell photoionization of ground-state Li-like carbon [C${}^{3+}$(1s${}^2$2s ${}^2$S)] ions were measured by employing the ion-photon merged-beams technique at the Advanced Light Source. The energy ranges 299.8--300.15 eV, 303.29--303.58 eV and 335.61--337.57 eV of the [1s(2s2p)${}^3$P]${}^2$P, [1s(2s2p)${}^1$P]${}^2$P and [(1s2s)${}^3$S 3p]${}^2$P resonances, respectively, were investigated using resolving powers of up to 6000. The autoionization linewidth of the [1s(2s2p)${}^1$P]${}^2$P resonance was measured to be $27\pm 5$ meV and compares favourably with a theoretical result of 26 meV obtained from the intermediate coupling R-Matrix method. The present photoionization cross section results are compared with the outcome from photorecombination measurements by employing the principle of detailed balance.

3 figures and 2 tables