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

TL;DR

This study measures and compares the absolute K-shell photoionization cross sections of Li-like carbon ions with theoretical calculations and photorecombination data, providing detailed resonance information and linewidths.

Contribution

It provides new high-resolution experimental data on K-shell photoionization of C$^{3+}$ ions and compares these results with advanced theoretical models and photorecombination measurements.

Findings

Autoionization linewidth of 27 ± 5 meV for the [1s(2s2p)$^1$P]$^2$P resonance

Experimental cross sections agree well with R-Matrix theoretical results

Comparison with photorecombination data confirms detailed balance principles

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.