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Projectile electron loss in collisions of light charged ions with helium

Chinese Physics B 2014年第5期23卷 244-248页

作者：尹永智王赟陈熙萌 School of Nuclear Science and Technology Lanzhou University Department of Radiation Protection Gansu Provincial Center for Disease Control and Prevention

We investigate the single-electron loss processes of light charged ions （Li^1＋,2＋, C^2＋,3＋,5＋, and O^2＋,3＋） in collisions with helium. To better understand the experimental results, we propose a theoretical model to calculate the cross section of projectile electron loss. In this model, an ionization radius of the incident ion was defined under the classical over-barrier model, and we developed ＂strings＂ to explain the processes of projectile electron loss, which is similar with the molecular over-barrier model. Theoretical calculations are in good agreement with the experimental results for the cross section of single-electron loss and the ratio of double-to-single ionization of helium associated with one-electron loss.

关键词： ion-atom collision over-barrier model electron loss

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Cross sections of O^(q+)(q=1-4) electron loss in collisions with He,Ne and Ar

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Chinese Physics B 2011年第3期20卷 198-202页

作者：鲁彦霞路兴强宋想张泊丽 School of Nuclear Science and Technology University of South China

electron-loss cross sections of 0q＋（q = 1 -4） colliding with He, Ne and Ar atoms are measured in the intermediate velocity regime. The ratios of the cross sections of two-electron loss to that of one-electron loss R21 are presented. It is shown that single-channel analysis is not sufficient to explain the results, but that projectile electron loss, electron capture by the projectile and target ionization must be considered together to interpret the experimental data. The screening and antiscreening effects can account for the threshold velocity results, but cannot explain the dependence of the ratio R21 on velocity quantitatively. In general, the effective charge of the target atom increases with velocity increasing because the high-speed projectile ion can penetrate into the inner electronic shell of target atom. Ne and Ar atoms have similar effective charges in this velocity regime, but He atoms have smaller ones at the same velocities due to its smaller nuclear charge.

关键词： ion-atom collision cross section electron loss

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Multiple ionization of argon accompanied by electron loss and capture of 0.22-6.35 MeV C^q＋ ions

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Chinese Physics B 2007年第8期16卷 2378-2383页

作者：陈林陈熙萌邵剑雄鲁彦霞丁宝卫崔莹高志民刘玉文杜娟谢江山孙光智刘兆远 Department of Modern Physics Lanzhou University Lanzhou 730000 China

In this paper a projectile ions recoil ions coincidence technique is employed to investigate the target ionization and projectile charge state changing processes in the collision of 0.22-6.35 MeV Cq^＋（q = 1 - 4） ions with argon atoms. The partial cross section ratios of the double, triple, quadruplicate ionization to the single ionization （or the single capture） of argon associated with single electron loss （or single electron capture） by the projectile are measured and compared with the previous experimental results. In the present experiment, it is observed that the ratios of ionization cross sections R associated with single loss and single capture depend strongly on the projectile charge state and vary significantly with different reaction channels as impact energy increases. In addition, this paper gets empirical scaling laws for the ionization cross section ratios R corresponding to the projectile single loss and finds that the ratios of the double ionization to the single ionization associated with single electron capture remain constant in the present energy range.

关键词： multiple ionization electron loss electron capture ion-atom collisions

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Production of recoil ions He^i＋ accompanied by single electron loss of 0.2-7 MeV C^q＋ and 0.25-5 MeV O^q＋（q = 1- 4） ions

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Chinese Physics B 2007年第8期16卷 2384-2388页

作者：陈熙萌鲁彦霞丁宝卫刘玉文崔莹高志民付宏斌杜娟邵剑雄 School of Nuclear Science and Technology of Lanzhou University Lanzhou 730000 China

Target ionization accompanied with projectile electron loss is investigated for 0.2-7 MeV C^q＋（q = 1 - 4） with He and 0.25-5 MeV O^q＋（q = 1 - 4） with He collisions. For projectile single-electron loss channel, the He double-to-single ionization ratio R is nearly independent of projectile charge state but dependent on the nuclear charge of projectile Zp. The results are analysed with atomic structure qualitatively. So far there have not existed the experimental data comparable with our results, to our knowledge. The ratio R is interpreted in terms of the two-step mechanism. This analysis agrees well with similar experiments in the literature.

关键词： ion-atom collision cross-section electron loss

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