Electron transfer in collisions of doubly charged atomic ions with rare-gas atoms for primary-ion energies below 100 eV

Cross sections are measured for several electron-transfer processes of the form An++B→A(n−1)++⋅⋅⋅, where A and B are atoms. Cross sections for most of these reactions are moderately large (∼0.5 Å2) somewhere in the energy range examined, but cross sections for He2++He, Ne2++He, Ne2++Ne, and Ar2++Ar are quite small. Examination of the potential-energy curves of the reactants and products seems qualitatively to account for many of the observations.