中国物理B ›› 2008, Vol. 17 ›› Issue (11): 4193-4198.doi: 10.1088/1674-1056/17/11/039

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The direct ionization processes in the collisions of partially stripped carbon and oxygen ions with helium atoms at low-to-intermediate energies

周春林, 邵剑雄, 陈熙萌, 孙光智, 邹贤容   

  1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 收稿日期:2008-05-04 修回日期:2008-05-16 出版日期:2008-11-20 发布日期:2008-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10775063).

The direct ionization processes in the collisions of partially stripped carbon and oxygen ions with helium atoms at low-to-intermediate energies

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)   

  1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • Received:2008-05-04 Revised:2008-05-16 Online:2008-11-20 Published:2008-11-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10775063).

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摘要： 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 \wx{Phys. Rev. {\rm 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.

关键词: effective charge, partially stripped ions, cross-section ratio, direct ionization

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.

Key words: effective charge, partially stripped ions, cross-section ratio, direct ionization

中图分类号:  (Scattering of atoms and molecules)

  • 34.50.-s
34.10.+x (General theories and models of atomic and molecular collisions and interactions (including statistical theories, transition state, stochastic and trajectory models, etc.))