科研之友
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摘要
The double to single ionization ratios R(21) of helium bombarded by slow (v(Bohr)< v < 4v(Bohr)) C(2+) and C(3+) ions are measured by the time-of-flight and coincidence technique. When the velocity is about 3v(Bohr), the values of R(21) by C(q+) reach a maximum and are found to be 2 times the values for bare ions such as He(2+) and Li(3+). A simple model is presented to estimate the single and double ionization cross sections of helium by various ions, and to present the scenario of multi-ionization in the low to intermediate energy range. The calculation results by the model are in excellent agreement with the experimental data.
- 出版日期2008-4
- 单位兰州大学
