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Compilation of the data-base of symmetric charge-transfer cross section

对称电荷转移截面数据库的编制

基本信息

批准号：
05640456
负责人：
SAKABE Shuji
金额：
$ 1.34万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640456/
关键词：
charge-trasfer cross section crossed-beam gadolinium

项目摘要

Cross sections for resonant charge transfer between atoms and their positive ions have been calculated for all non-transition elements in the range of low and intermediate collision velocities (<la.u.), and experimental data obtained since the 1930's have been compiled. The cross sections have been calculated by the impact-parameter and close-coupling methods. To solve the one electron time-dependent, spinless electronic wavefunction in a two atom system, the wavefunction was expanded in terms of a set of traveling atomic wavefunctions centered about either nucleus. As the eigenfunction of each atom, Hartree Fock Slater wavefunctions were used. The calculated results are in fairly good agreement with the compiled experimental results for the thoroughly studied elements and, thus, provide a useful interpolation/extrapolation of the experimental data.A modified crossed-beam apparatus to measure charge-transfer cross sections of metallic elements in wide impact-energy range (10-1000eV) has been developed. The charge-transfer cross section between a gadolinium atom and its positive ion has been measured with a crossed-beam apparatus which features primary ion production by photoionization with a tunable dye laser. The initial state of Gd ions were controlled to be in the ground state by tuning the photon energy to be closed to the ionization potential energy. The Gd ions in the ground states were collided with the Gd atoms in the ground and some excited states. The cross sections as a function of impact-energy (30-1000eV) were successfully obtained. The cross section at 1000eV was 3.3x10^<-14>cm^2. The obtained cross sections are larger than those of^ハother elements obtained experimentally in the past.

计算了所有非过渡元素在低和中碰撞速度 (<la.u.) 范围内的原子与其正离子之间共振电荷转移的截面，并汇编了自 1930 年代以来获得的实验数据。横截面是通过冲击参数和紧耦合方法计算的。为了求解双原子系统中的单电子时间相关、无自旋电子波函数，波函数被扩展为一组以任一核为中心的行进原子波函数。使用 Hartree Fock Slater 波函数作为每个原子的本征函数。计算结果与深入研究的元素的实验结果非常吻合，因此，为实验数据提供了有用的内插/外推。已经开发出一种改进的交叉束装置，用于测量宽冲击能量范围（10-1000eV）内金属元素的电荷转移横截面。钆原子与其正离子之间的电荷转移截面是用交叉束装置测量的，该装置的特点是通过可调谐染料激光器的光电离产生初级离子。通过调节光子能量接近电离势能，将 Gd 离子的初始态控制在基态。基态的 Gd 离子与基态和一些激发态的 Gd 原子碰撞。成功获得了作为冲击能量（30-1000eV）函数的横截面。 1000eV时的截面为3.3×10^-14cm^2。所获得的横截面大于过去通过实验获得的其他单元的横截面。