ELECTRON-SPECTRA FROM SINGLET AND TRIPLET-STATES OF N3-ENERGY N5++HE,NE AND AR COLLISIONS((1S(2)3L3L', 1S(2)3L4L') PRODUCED BY LOW)

Ejected electrons from the singlet and triplet states of doubly excite d N3+(1s(2)3l3l') and N3+(1s(2)3l4l') ions, produced by 25, 50, 75 and 100 keV N5+(1s(2))+He, Ne and Ar collisions have been measured with h igh-resolution 0 degrees electron spectroscopy. Only singlet states we re observed when the target was He; in contrast, many triplet states w ere observed in N5+(1S(2))+Ne and Ar collisions. Both singlet and trip let states contributed to the electron spectra in N5++Ar collisions, i n particular, triplet states were conspicuous at low energy. Two theor etical methods, perturbation theory or Z expansion (MZ code) and multi configurational Hartree-Fock (Cowan code) were used for identification of ejected-electron spectra. The collision energy dependence of the s pectra is discussed.