We present energy spectra of autoionization electrons resulting from collisions between fully stripped 15 N 7+ ions aid Ar in the energy range of 1-10 keV amu -1 . These spectra have been measured in coincidence with charge-state analysed Ar ions. Observed populations of the various configurations are discussed in the framework of the classical overbarrier model. Our measurements suggest that target-ion excitation together with two-electron capture is an important process in collisions between bare N 7+ ions and Ar. We find evidence that radiative stabilization of doubly excited N 5+ (4l, 4l') states is even stronger than was thought up to now.
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Nijs et al. (1994) studied this question.