Abstract The values of direct double- to-single ionization ratio $R$ of helium atoms induced by C$^{q + }$, O$^{q + }$ ($q=1-4$) ions at incident energies from 0.2 to 8.5MeV are measured. Based on the existing model (Shao J X, Chen X M and Ding B W 2007 Phys. Rev. A 75 012701) the effective charge of the projectile is introduced to theoretically estimate the value of $R$ for the partially stripped ions impacting on helium atoms. The results calculated from our ``effective charge'' model are in good agreement with the experimental data, and the dependence of the effective charge on the ionization energy of the projectile is also discussed qualitatively.
Received: 04 May 2008
Revised: 16 May 2008
Accepted manuscript online:
(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 No 10775063).
Cite this article:
Zhou Chun-Lin (周春林), Shao Jian-Xiong (邵剑雄), Chen Xi-Meng (陈熙萌), Sun Guang-Zhi (孙光智), Zou Xian-Rong (邹贤容) The direct ionization processes in the collisions of partially stripped carbon and oxygen ions with helium atoms at low-to-intermediate energies 2008 Chin. Phys. B 17 4193
Single-and-double electron loss of O2+ in collisions with argon and helium Liu Yu-Wen(刘玉文), Chen Xi-Meng(陈熙萌), Lu Yan-Xia(鲁彦霞), Ding Bao-Wei(丁宝卫), Fu Hong-Bin(付宏斌), Gao Zhi-Min(高志民), Cui Ying(崔莹), Shao Jian-Xiong(邵剑雄), Sun Guang-Zhi(孙光智), Chen Lin(陈林), and Yin Yong-Zhi(尹永智). Chin. Phys. B, 2008, 17(7): 2590-2593.
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