Charge transfer cross sections for slow Ne2--5+ ions on He and H2

The single- and double-electron capture cross sections, σsub(q,q-1) and σsub(q,q-2) respectively, for Nesup(q+) (q=2--5 and q=2--4) ions on He and H2 have been measured in the energy range from 1.5 to 12keV/q. The results are consistent with the existing data except for q=2 and are monotone against impact energy. The σsub(q,q-1) values, which do not satisfy the known scaling laws, are fairly well explained by the classical one electron model, while the σsub(q,q-2)'s cannot be fitted to the reported scaling rule and model. Therefore our new model is applied that projectile ion captures one or two electrons from target in a statistical way. (author)