玻恩近似下电子与离子碰撞的多组态计算

研究电子与离子碰撞激发过程,在波恩近似下,用多组态平面波与多组态库仑波方法计算振子强度与碰撞强度,并且编制了相应程序MCPBA(九)和MCCBX(九)。以四个组态、27个能级的类Ne-锗为例,从基态开始激发。用MCPBA(九)计算了13个包含直接碰撞的过程。用MCCBX(九)给出了全部26个交换效应的碰撞强度。考虑了不同离子波函数对碰撞强度的影响。还与国外扭曲波计算数据进行了比较。结果表明,对某些激发过程必须进行多组态计算,改进离子波函数的计算甚至比改进碰撞电子波函数更为重要。

ELECTRON IMPACT EXCITATION OF MULTI-CONFIGURATON IONS IN THE BORN APPROXIMATION

A study of electron impact excitation of charged ions is reported here. Electron collision strengths and oscillator strengths have been calculated using plane -wave and Coulomb ?wave Born approximation with configuration interactions. The corresponding programs MCPBA(9) and MCCBX(9) have been compiled . As an example, we give the calculation results of Ne -like Ge ion with 27 levels and 4 configurations from its ground state. 13 different processes which contain direct collision only have been calculated with MCPBA (9 ).The collision strengths of 26 different processes which include exchange collisions have also been calculated with MCPBA (9 ). The effect of wavefunction on the collision strengths has been examined . Our results are compared with the available results of distorted wave . It has been found from the result that the accuracy of the target wave function is much more important than that of the collision electron wave function .