中国物理B ›› 2007, Vol. 16 ›› Issue (7): 2040-2043.doi: 10.1088/1009-1963/16/7/039

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

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   

  1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 收稿日期:2006-08-16 修回日期:2007-02-05 出版日期:2007-07-20 发布日期:2007-07-04
  • 基金资助:
    Project supported by the Special Program for Key Basic Research of the Ministry of Science and Technology, China (Grant No 2002CCA00900).

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

Chen Xi-Meng(陈熙萌), Gao Zhi-Min(高志民)†, Liu Zhao-Yuan(刘兆远), Ding Bao-Wei(丁宝卫), Lu Yan-Xia(鲁彦霞), Fu Hong-Bin(付宏斌), Shao Jian-Xiong(邵剑雄), Cui Ying(崔莹), Zhang Hong-Qiang(张红强), Liu Yu-Wen(刘玉文), Du Juan(杜娟), and Sun Guang-Zhi(孙光智)   

  1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • Received:2006-08-16 Revised:2007-02-05 Online:2007-07-20 Published:2007-07-04
  • Supported by:
    Project supported by the Special Program for Key Basic Research of the Ministry of Science and Technology, China (Grant No 2002CCA00900).

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摘要： The ratios of transfer ionization (TI) to single-electron capture (SC) cross sections have been measured for the collisions of partially stripped Cq+ ions (q=1--4) with He. The collision velocity ranges from 0.7 to 4.4v0 (v0 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 3.7v0 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

Abstract: The ratios of transfer ionization (TI) to single-electron capture (SC) cross sections have been measured for the collisions of partially stripped Cq+ ions (q=1--4) with He. The collision velocity ranges from 0.7 to 4.4v0 (v0 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 3.7v0. 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.

Key words: ion--atom collision, transfer ionization, electron capture, cross-section ratios

中图分类号:  (Electronic excitation and ionization of atoms (including beam-foil excitation and ionization))

  • 34.50.Fa
34.70.+e (Charge transfer)