STATE-SELECTIVE DOUBLE-ELECTRON CAPTURE IN LOW-VELOCITY NE10-ION MOMENTUM SPECTROSCOPY(+HE COLLISIONS STUDIED BY RECOIL)

State-selective double-electron capture from He by a fully stripped 15 0 keV Ne10+ projectile is investigated by recoil-ion momentum spectros copy (RIMS). For each event, identified by the projectile and recoil-i on final charge states, the full recoil-ion momentum vector allows the determination of the e-value and the scattering angle simultaneously, thus leading to doubly differential cross sections for each channel. This collision system has already been studied by energy gain, electro n and photon spectroscopy as well as theoretically. A large fraction o f the doubly excited states populated were found to be non-or weakly a utoionizing. In this paper all channels are recorded together so that a detailed balance between channels can be discussed and compared with existing data. Special emphasis is brought to the analysis of the ang ular behaviour to highlight the population mechanism for the channels contributing to the 'double-capture stabilization'. in particular, a n ew pathway leading to transfer excitation channels in double capture i s proposed.