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A theoretical study on resonance phenomena in electron capture by highly-charged ions from electronic-excited targets

电子激发靶高电荷离子俘获共振现象的理论研究

基本信息

批准号：
09640480
负责人：
SHIMAKURA Noriyuki
金额：
$ 1.92万
依托单位：
NIIGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

1. It is anticipated that resonance phenomena in electron-capture processes occur at higher collision energies as the charge of projectile ions and the dipole polarizability of targets become large. The cross sections of electron capture by highly-charged ions of Be, B, C, N, and O atoms from H, HィイD22ィエD2, and He targets were calculated. Resonances appeared at E ≦ 0.01 and ≦ 0.015 eV/amu in the (BeィイD13+ィエD1 + H) and (NィイD15+ィエD1 + H) systems, respectively.2. Electronic-excited atoms have large dipole polarizability, so we calculated cross sections for electron capture processes from the electronic-excited targets. The results showed that the electronic-excited targets were not appropriate for the measurement of resonance because of the repulsion between its and other potential energy curves and because of undesirable transitions at many potential crossing points.3. Alkali metal atoms have large dipole polarizability, so we calculated the cross sections for electron capture processes by BeィイD1q+ィエD1 and BィイD1q+ィエD1 ions (q = 2, 3) from alkali metal targets. In the (BeィイD12+ィエD1 + Li) system, resonance occurred at E ≦ 0.06 eV. So, for the systems of (highly-charged ions of He, Be, B, C, N, O + alkali metal atoms), the calculations of the cross section were continued. In the case of (HeィイD12+ィエD1 + Na) system, resonance appeared at E ≦ 0.3 eV.4. In order to make clear the mechanism of resonance phenomena, some codes based on wave-packet were developed. The quantum-mechanical multi-channel time-dependent close-coupling method was applied to (NィイD15+ィエD1 + H) collision system. The formation of quasi-bound molecule, which stays at rovibrational state with long lifetime (0.5 psec - 20 psec), could be confirmed.

1.据预计，在电子捕获过程中的共振现象发生在较高的碰撞能量的电荷的弹丸离子和偶极子极化率的目标变得大。计算了Be、B、C、N和O等高电荷态离子从H、H靶D_（22）、H靶D_（22）和He靶中俘获电子的截面。在（Be配体D13+ H2配体D1 + H）和（N配体D15+ H2配体D1 + H）体系中，分别在E = 0.01eV/amu和E = 0.015eV/amu处出现共振.电子激发态原子具有较大的偶极极化率，因此我们计算了电子从电子激发态靶中俘获的截面。结果表明，电子激发的靶不适合共振测量，因为其势能曲线与其他势能曲线之间存在排斥作用，并且在许多势能交叉点处存在不期望的跃迁.碱金属原子具有较大的偶极极化率，因此我们计算了Be离子D1 q + B1 D1和B离子D1 q + B1 D1（q = 2，3）从碱金属靶上俘获电子的截面.在（Be_xD_（12）+Li_xD_（1））体系中，在E_x0.06 eV处发生共振。因此，对于高电荷态离子He，Be，B，C，N，O +碱金属原子的体系，继续计算截面。在（He_（12）+He_（13）D_1 + Na）体系中，共振出现在E_（0.3）eV处。为了弄清共振现象的机理，开发了基于波包的程序。将量子力学多道含时密耦合方法应用于（N_xD_（15）+N_xD_（1 + H））碰撞体系。证实了准束缚态分子的形成，该分子处于长寿命（0.5 psec - 20 psec）的振转态。