A COINCIDENCE STUDY OF MULTIPLE-ELECTRON CAPTURE IN N-15(7-AR COLLISIONS())

We present energy spectra of autoionization electrons resulting from c ollisions between fully stripped N-15(7+) ions and Ar in the energy ra nge of 1-10 keV amu-1. These spectra have been measured in coincidence with charge-state analysed Ar ions. Observed populations of the vario us configurations are discussed in the framework of the classical over barrier model. Our measurements suggest that target-ion excitation tog ether with two-electron capture is an important process in collisions between bare N7+ ions and Ar. We find evidence that radiative stabiliz ation of doubly excited N5+(4l, 4l') states is even stronger than was thought up to now.