Multiple ionization of Ne$^{+}$ ions by photoabsorption near the K edge

Single, double and triple photoionization of Ne+ ions by single photons have been investigated at PETRA III in Hamburg [1]. Absolute cross sections were measured using the photon-ion merged-beams technique [2]. Photon energies were between 840 and 930 eV, covering the range from the lowest-energy resonances associated with the excitation of one single K-shell electron up to double excitations involving one K- and one L-shell electron, well beyond the K-shell ionization threshold. Photoionization of neutral Ne was also studied just below the K edge. The photon energy bandwidths were between 32 and 500 meV, facilitating the determination of natural line widths. For comparison with theoretical calculations, astrophysically relevant photoabsorption cross sections were inferred by summing the measured partial ionization channels. The observed resonances in the final ionization channels reveals the presence of complex Auger-decay mechanisms