STATE-SELECTIVE DOUBLE CAPTURE IN COLLISIONS OF BARE IONS WITH HELIUM-ATOMS AT LOW ENERGIES .2. EJECTED-ELECTRON SPECTRA

The Auger electron spectra of doubly excited states of ions resulting from double capture in collisions of bare ions with helium atoms in the energy range of a few keV amu-1 are calculated. The electron capture amplitudes are obtained in the independent-electron approximation. By combining these amplitudes with the Auger decay amplitudes and taking into account the post-collision interaction effect and the interference from different states, the electron spectra as a function of the ejection angles are evaluated. Calculations have been carried out for the electron spectra of 2l3l' doubly excited states of C4+ from C6+ -He collisions and of 3l3l' doubly excited states of O6+ from O8+ -He collisions. The theoretical results are compared with measured Auger electron spectra.