Transfer ionization of the isocharge sequence ion and Ar collisions
Cai Xiao-Hong (蔡晓红)a, Yu De-Yang (于得洋)a, Cao Zhu-Rong (曹柱荣)a, Lu Rong-Chun (卢荣春)a, Yang Wei (杨威)a, Shao Cao-Jie (邵曹杰)a, Chen Xi-Meng (陈熙萌)b
a Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; b Department of Modern Physics, Lanzhou University, Lanzhou 730000, China
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.
Received: 15 December 2003
Revised: 01 June 2004
Accepted manuscript online:
PACS:
34.50.Fa
(Electronic excitation and ionization of atoms (including beam-foil excitation and ionization))
(General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.))
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10134010, 10375080 and 10304019).
Cite this article:
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) Transfer ionization of the isocharge sequence ion and Ar collisions 2004 Chinese Physics 13 1679
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