关键词: charge transfer, transfer ionization

Abstract: The ratios of transfer ionization to single capture for isocharge C$^{q+}$, N$^{q+}$, O$^{q+}$, Ne$^{q+}$ ions on Ar atoms are measured by using position-sensitive and time-of-flight techniques. It is found that the ratio $R_{1}$ increases with nuclear charge $Z$ in a $q=4$ sequence, and the ratio $R_{1}$ sequences have the minimum values at $Z=7$ and $Z=8$ in $q=5$ and $q=6$ sequences, respectively, and the ratio $R_{1}$ decreases with the increase in the nuclear charge $Z$ in a $q=7$ sequence. The results may be explained within the frame of the statistical model. It may be concluded that the transfer ionization depends remarkably upon the electronic structure of the projectile. The projectiles used in this study have the same charge state and velocity, but different electronic structures. The dependence of the ratio $R_{1}$ on q is studied for Ne$^{q+}$-Ar collisions. The ratio $R_{1}$ is found to increase as q increases for Ne$^{q+}$－Ar collisions. The measured dependence of the ratio $R_{1}$ on q is compared with the calculation using the molecular Coulomb over-barrier model.

Key words: charge transfer, transfer ionization