Inelastic electronic excitation and electron transfer processes in collisions between Mg(3S01) atoms and K+(S01) ions studied by crossed beams in the 0.10-3.80-keV energy range

Inelastic and charge-transfer excitation processes in collisions between ground-state neutral Mg atoms and K+ ions have been studied by means of a crossed molecular-beam technique. Decay fluorescent emissions from Mg(3P11),Mg(4S13), and Mg(3s13d1,3D3,2,13) as well as the phosphorescent emission due to Mg(3P13) have been observed from excited Mg atoms and the charge-transfer emission decays from K(4P3∕2,1∕22),K(5P3∕2,1∕22),K(6S1∕22), and K(4D5∕2,3∕22) for excited K atoms. The corresponding absolute cross-sections values versus collision energy functions were determined in the 0.10–3.80 keV laboratory energy range. In order to interpret the experimental results, accurate ab initio full configuration-interaction calculations using pseudopotentials have been performed for the (Mg–K)+ system, giving a manifold of adiabatic singlet and triplet potential-energy curves correlating with the different collision channels, which allow a qualitative interpretation of the emission excitation functions measured for the ...