Investigation of transfer ionization in collisions of partially stripped carbon ions with helium at low to intermediate velocities  

作　　者：陈熙萌 高志民 刘兆远 丁宝卫 鲁彦霞 付宏斌 邵剑雄 崔莹 张红强 刘玉文 杜娟 孙光智 

机构地区：[1]School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China

出　　处：《Chinese Physics B》2007年第7期2040-2043,共4页中国物理B（英文版）

摘　　要：The ratios of transfer ionization （TI） to single-electron capture （SC） cross sections have been measured for the collisions of partially stripped C^q＋ ions （q = 1-4） with He. The collision velocity ranges from 0.7 to 4.4 vo （vo is the Bohr velocity）. The projectile-ion and recoil-ion coincidence technique is used to separate the processes of TI and SC. The ratios reach the maximum when the velocity is about 3.7 vo. This can be explained qualitatively based on the two-step mechanism. The experimental results are also compared with the results calculated using the classical trajectory Monte Carlo （CTMC） method. The CTMC results are in agreement with the experimental data basically. The discrepancies in higher velocity region are interpreted by the effective charge effect.The ratios of transfer ionization （TI） to single-electron capture （SC） cross sections have been measured for the collisions of partially stripped C^q＋ ions （q = 1-4） with He. The collision velocity ranges from 0.7 to 4.4 vo （vo is the Bohr velocity）. The projectile-ion and recoil-ion coincidence technique is used to separate the processes of TI and SC. The ratios reach the maximum when the velocity is about 3.7 vo. This can be explained qualitatively based on the two-step mechanism. The experimental results are also compared with the results calculated using the classical trajectory Monte Carlo （CTMC） method. The CTMC results are in agreement with the experimental data basically. The discrepancies in higher velocity region are interpreted by the effective charge effect.

关 键 词：ion-atom collision transfer ionization electron capture cross-section ratios 

分 类 号：O53[理学—等离子体物理]