Electron spectra from singlet and triplet states of Ne6+** produced by lowenergy Ne8++He, Ne and Ar collisions

Ejected electron spectra from the singlet and triplet states of doubly exci ted Ne6+**(1s(2) 2pnl), Ne6+**(1s(2) 3l3l ') and Ne6+**(1s(2)3l4l ') ions, produced by 80 keV Ne8+(1s(2)) + He, Ne and Ar collisions, have been measur ed by means of a zero-degree electron spectroscopy. Only singlet states wer e observed when the target was He. In contrast, the contribution from the t riplet states prevailed in the spectra for the Ne target. For the Ar target , practically no signals were observed in the energy region for the 1s(2)3l nl ' states. Two theoretical methods, the perturbation theory (MZ code) and the multi-configurational Hartree-Fock (Cowan code) were used for identifi cation of ejected-electron spectra. Using the (j) string analysis in the ex tended classical over-barrier model, we discuss the possibility of the part icipation of inner electrons in the process of double-electron capture by h ighly charged ion multi-electron target atoms.