Investigation of transfer ionization in collisions of partially stripped carbon ions with helium at low to intermediate velocities |
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Authors: | Chen Xi-Meng Gao Zhi-Min Liu Zhao-Yuan Ding Bao-Wei Lu Yan-Xi Fu Hong-Bin Shao Jian-Xiong Cui Ying Zhang Hong-Qiang Liu Yu-Wen Du Juan and Sun Guang-Zhi |
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Institution: | School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China |
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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. |
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Keywords: | ion--atom collision transfer
ionization electron capture cross-section ratios |
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