Theoretical study of charge-exchange processes in collisions of highly-charged ions with Helium atoms

1.收集了高电荷态离子与中性原子碰撞中电子俘获过程的实验和计算数据。出版了一本参考书目。计算了O^6+离子与He碰撞的电子俘获截面.结果表明：（1）在R - 5 Au处，电子俘获主要是由初始通道与O^<5+>（31）通道之间的径向耦合决定的.（2）在中速区，我们的计算结果与原子轨道方法的计算结果符合得很好.（3）在低速区，我们的计算结果比其他计算结果更能解释电子俘获机制.（4）在低速区，重粒子的运动必须采用库仑轨道.为了研究电子俘获截面对入射粒子和靶粒子的依赖性，计算了（Be^<q+>+He），（Be^<q +>+H）和（B^<q+>+He）体系的势能.我们首先计算了它们的（Be^<3+>+H）体系的反应截面.结果非常有趣，所以我们把它们贡献给了一本杂志。此外，（B^<3+>+He）体系的计算也在进行中.该系统是一个罕见的例子，其中单，双电子捕获过程可以考虑只有十通道紧密耦合计算.计算了（Mg^<2+>+He）体系的微分截面和单电子俘获过程的排列.（N^<5+>+He）：势能和耦合矩阵元的计算表明，为了准确地获得截面，必须有十道。计算包括两个双电子捕获通道，除了他们现在正在进行中。

1. We collected the data of experiments and calculations for electron capture processes in collisions of highly-charged ions with neutral atoms. A book of bibliography was published.2. The electron capture corss sections in collisions of O^<6+> ion with He were calculated. The results indicate: (1) The electron capture is dominated by the radial couplings between initial channel and O^<5+>(31) channels at R - 5 au ; (2) In the intermediate velocity region our results are good agreement with the calculated results using atomic orbital method ; (3) It is found that in lower velocity region our calculation explains the mechanism more successfully than other calculations ; (4) In lower velocity region we must use a Coulomb trajectory for heavy particle motions.3. In order to study the dependence of electron capture cross sections on projectile- and target-particles the potential energies were calculated for (Be^<q+>+He), (Be^<q+>+H) and (B^<q+>+He) systems. We calculated the cross sections for (Be^<3+>+H) system of them firstly. The results were very interesting so that we contributed them to a journal. Furthermore the calculation for the (B^<3+>+He) system is now in progress. This system is rare example in which single and double electron capture processes can be considered only with ten-channel close coupling calculations.4. The differential cross sections and the alignments of single-electron capture processes for (Mg^<2+>+He) system were calculated.5. (N^<5+>+He) : The calculation of the potential energies and coupling matrix elements indicated that ten-channel were necessary in order to obtain the cross sections correctly. Calculations including two-double electron capture channels in addition to them is now in progress.