低能Ar3+ + Ar碰撞反应过程实验研究

测量了入射离子能量为27 keV、45 keV和66 keV时Ar3 Ar碰撞反应各子过程的分截面,通过将其归一化到Bliman,Dousson等人所测量的截面值,获得了绝对截面.结果表明,该能区电子俘获过程仍占主导地位,但转移电离过程已不能忽略.结果还表明,各子过程反应截面基本不随能量变化.与考虑自电离的MCBM(Molecular Coulombic overBarrier Model)模型比较发现,模型所给截面普遍高于实验测量值,这在一定程度上是由于归一化时带来的系统误差.在误差允许的范围内,单电子和双电子俘获截面符合的比较好,但三电子俘获截面却相差一个数量级.对于实验观测到的转移电离过程,模型却预言并没有此过程发生.

Experimental study of low energy Ar3+ on Ar collisions

Charge transfer processes for Ar~3 on Ar collisions at 27 keV,45 keV and 66 keV have been studied,and absolute cross sections for each channel have been obtained by normalizing to the cross sections reported by Bliman,Dousson,et al.Experiment shows that electron capture is the dominant process;transfer ionization contributions,however,can not be neglected.Further more,the cross sections for each channel found to be independent on projectile energy.The experimental results have also been compared with theoretical calculations,which are based on the MCBM(Molecular Coulombic overBarrier Model) considering auto-ionization.The model calculations predict there are no transfer ionization contributions,but experiments found that transfer ionization contributions are not negligible.For single-and double-electron capture,the experimental results are in reasonable agreement with the MCBM calculations,but MCBM predicts larger cross sections,and for triple-electron capture,the result of MCBM is one order bigger than the measured value.