Binding energy enhancement in the isocharge sequence of ions in collisions with Ne

Abstract

The dependence of the ratio R 1 for transfer ionization to single capture for C q+ , N q+ , O q+ , Ne q+ ions on Ne target upon the electronic structure of the projectile is studied by using position sensitive and time-of-flight techniques. It is found that for A q+ –Ne collisions the ratio R 1 decreases as the atomic number of the projectile increases for q=4,5,6,7 sequences which differs markedly from the results we obtained for A q+ –Ar collisions. The difference is explained by using a statistical model and the orbital penetration picture. Comparison of the R 1 ratios of A 4+–Ne and A 4+–Ar collisions provides strong evidence for the increase of the binding energy of the target valence electron after single electron capture. The increase in binding energy depends both upon the atomic number of the projectile Z 1 and the target atom Z 2. The larger Z 1, the larger the increase in binding energy, while the larger Z 2, the smaller the increase in binding energy.