ON TRANSFER-EXCITATION IN SLOW ION HELIUM COLLISIONS

Simultaneous transfer and excitation of the two helium electrons in sl ow collisions of a helium target with multiply charged ions is discuss ed and calculated for the example of C6+ projectiles around 10 keV/u i mpact energies. The cross section for transfer-excitation is found to be much larger than the cross section for single excitation. There are indications that the cross sections for transfer-excitation scale, wi th respect to impact energy and projectile charge state, much in the s ame way as cross sections for transfer ionization.