Theoretical Study of Electron Capture Processes from Hydrogen Atoms and Molecules by Multiply Charged Ions of Carbon, Nitrogen and Oxygen.

1.完成了双通道、三通道和三十通道情况下的量子力学紧耦合程序。用以下方法计算了(N^&lt；6&gt；，O^&lt；7&gt；H)体系的电子俘获截面：(1)用GVB-CI方法计算电子态；(2)用ETF计算径向和角向耦合；(3)用半经典方法和量子力学方法分别计算较高和较低碰撞能下的电子俘获截面。所得结果与实验结果吻合较好。计算了(N^&lt；5&gt；H)体系的电子俘获截面。我们的结果与实验吻合得很好。在低碰撞能下，轨道机制产生了一个较大的宽峰。在更低的碰撞能下，发现了由瞬时准分子的振荡态引起的几种形状共振。对(N^&lt；4&gt；H)体系的电子俘获过程进行了计算。在所有能量范围内，本计算与测量结果的一致性都很好。在中等碰撞能量下的总截面上出现了一个有趣的结构。计算了(C^&lt；5&gt；H)体系的电子俘获截面。计算结果与实验结果吻合较好。通过将这些结果与(B^&lt；5&gt；H)和(N^&lt；5&gt；H)系统的结果进行比较，发现了一个有趣的核心效应。计算了(O^&lt；5&gt；H)体系的电子俘获截面。我们的结果表明，在这个系统中，除了单电子俘获，双电子过程(转移激发)是非常重要的。与最近的实验相一致是合理的。

1. Quantum-mechanical close-coupling programs for the cases of two, three, and thirty channels were completed.2. Electron-capture cross sections for (N^<6+>, O^<7+> + H) systems were calculated by the following method ; (1) the calculation of the electronic state by the GVB-CI method, (2) the calculation of the radial and angular couplings with ETF, (3) the calculation of the cross sections by a semi-classical and a quantum-mechanical methods at higher and lower collision energies, respectively. Obtained results are in good agreement with experimental ones.3. Electron-capture cross sections were calculated for (N^<5+> + H) system. Our results agree very well with experiments. At low collision energies, there appeared a large broad maximum arising from orbiting mechanism. At still lower collision energies, several shape resonances due to rovibrational states of the transient quasi-molecule were found.4. Calculations of the electron-capture processes for (N^<4+> + H) system were performed. The agreement of the present calculation with measurements is excellent at all energies. A interesting structure appeared in the total cross section at intermediate collision energies.5. Electron-capture cross sections for (C^<5+> + H) system were calculated. The results are in good agreement with experiments. By comparing these results with those of (B^<5+> + H) and (N^<5+> + H) systems, a interesting core effect was discovered.6. For (O^<5+> + H) system, electron-capture cross sections were calculated. Our results indicate that in addition to single electron capture, two electron process (transfer excitation) are very important in this system. Agreement with the most recent experiment is reasonable.