Electron spectra from doublet and quartet states of ) produced by 60 keV collisions

Abstract

Ejected electrons from the doublet and quartet states of doubly excited ions, produced by 60 keV collisions have been measured with high resolution zero-degree electron spectroscopy. Only the doublet states were observed in collisions with gas. Both doublet and quartet states were observed when was used as the target. Two theoretical methods, perturbation theory or Z-expansion (MZ code) and multi-configurational Hartree - Fock (Cowan code) were used for identification of peaks observed in ejected-electron spectra. Contributions of correlation effects are discussed by comparison with other theoretical energies.