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Transfer ionization of the isocharge sequence ion and Ar collisions
Cai Xiao-Hong (蔡晓红), Yu De-Yang (于得洋), Cao Zhu-Rong (曹柱荣), Lu Rong-Chun (卢荣春), Yang Wei (杨威), Shao Cao-Jie (邵曹杰), Chen Xi-Meng (陈熙萌)
Chinese Physics, 2004, 13 (10):
1679-1683.
DOI: 10.1088/1009-1963/13/10/018
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.
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