Singly and doubly charged ion collisions with neutrals into excited states

Recent experimental results on charge transfer into excited states in collisions between singly and doubly charged ions with He, Ne, Ar, H2 and O2 are presented, respectively. The energy range of the ion beams of Heq+, Arq+, Ne+ (q = 1,2) ions is (70-170) x q keV. The optical measurement was performed by an Optical Multichannel Analysis System (OMA). The wavelength range covered was 200-800 nm. Different processes of excitation have been observed in single and double charged ion collisions with neutrals. The dependence of emission cross sections on the potential energy defect is discussed. (author)