The direct ionization processes in the collisions of partially stripped carbon and oxygen ions with helium atoms at low-to-intermediate energies |
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Authors: | Zhou Chun-Lin Shao Jian-Xiong Chen Xi-Meng Sun Guang-Zhi and Zou Xian-Rong |
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Institution: | School of Nuclear Science and Technology, Lanzhou
University, Lanzhou 730000, China |
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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 \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. |
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Keywords: | effective charge partially
stripped ions cross-section ratio direct ionization |
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