Observation of the angle-resolved resonant Auger emission from the [ 1 s 2 p ] ( P 3 , 1 ) 3 p 2 P 1 doubly excited 2 p − 2 h states of Ne

A high-resolution photoabsorption spectrum of $\mathrm{Ne}$ has been measured in the energy range of the $[1s2p]n\ensuremath{\ell}{n}^{\ensuremath{'}}{\ensuremath{\ell}}^{\ensuremath{'}}$ doubly excited states, where square brackets indicate hole states, by means of photoion yield spectroscopy. The observed features have been interpreted by adopting a simple Rydberg formula. Energies as well as quantum defects for the members of the $[1s2p](^{3,1}P)3pnp$ $(3\ensuremath{\leqslant}n\ensuremath{\leqslant}5)$ series have been determined. We report observations of angle-resolved spectra of the resonant Auger (RA) transitions to the ${\mathrm{Ne}}^{+}$ $[2{p}^{3}]3{p}^{2}$ states and to the ${\mathrm{Ne}}^{+}$ $[2s2{p}^{2}]3{p}^{2}$ states from the $[1s2p](^{3,1}P)3{p}^{2}$ doubly excited states. These double-spectator-type transitions are confirmed by a good general agreement between the measured and theoretical RA spectra, where theoretical spectra are calculated based on the Hartree-Fock approximation. The measured anisotropy parameters are compared with theoretical predictions calculated using a pure $LS$ coupling approach. We have made assignments for several levels with the aid of theoretical calculations.