Photoionization of ${\mathrm{Ne}}^{3+}$ ions in the region of the $1\overrightarrow{s}2p$ autoionizing resonance

Photoion yields of ${\mathrm{Ne}}^{4+}$ from ${\mathrm{Ne}}^{3+}$ ions were successfully measured in the region of the $1\overrightarrow{s}2p$ autoionizing resonance by a photon-ion merged-beam technique. A broad structure centered at 864.5 eV, which is composed of several transitions, was observed in the photoion-yield spectrum. The spectrum was analyzed with the results of multiconfiguration Dirac-Fock calculations. The calculations revealed that the lines contained in the broad structure can be attributed to possible transitions from the ${2s}^2{2p}^3{}^4{S}_{3/2},$ ${}^2{D}_{3/2},$ and ${}^2{D}_{5/2}$ initial levels. The calculated spectrum satisfactorily shows an overall agreement with the experimental one.