Electron impact studies of resonances and autoionizing states of neon

Measurements have been made of the energy spectrum of electrons ejected from autoionizing states of neon with excitation energies in the region 41-46 eV; in particular, the lowest doubly excited autoionizing state of neon, the 2s 2 2p 4 3s 2 ( 3 P) state, has been observed positively. These studies have given detailed information on post-collision interaction effects. In addition, it has been shown that resonant excitation of autoionizing states via negative-ion states can be an important process and measurements have been made on a number of excited negative-ion states in the region 41-48 eV.