中低速C^3＋与He，Ne，Ar原子相互作用过程中单电子转移绝对截面的测量

Measurement of single-electron transfer cross sections in collisions of C^(3+) with He,Ne,Ar atoms at low to intermediate velocity

实验测量了1.7v0—4.2v0(v0为玻尔速度,v0=2.19×108cm/s)的C3+与He,Ne,Ar原子碰撞过程中单电子转移绝对截面.将实验结果与多体经典轨道蒙特卡罗模拟计算结果做了比较,发现测量结果与多体经典轨道蒙特卡罗模拟计算结果在趋势上相符.当入射离子速度在1.7v0—2.0v0时,因多体经典轨道蒙特卡罗方法计算时不能考虑多电子关联态俘获和极化效应的影响,实验值大于计算值.当入射离子速度在2.2v0—4.2v0时,由于被俘获电子对入射离子的不完全屏蔽,加上电子间的动态关联及有效电荷的影响,实验结果先与多体经典轨道蒙特卡罗计算结果符合很好,而后逐渐大于计算值.此外,还根据转移电离与单电子俘获的截面比简单分析了转移电离机制.

Absolute cross sections for single-electron transfer of He, Ne, Ar atoms induced by C^3＋ at low to intermediate velocity （1.7v0-4.2v0） were measured and calculated using n-body classical trajectory Monte Carlo （n CTMC） method. Though good overall agreements are achieved between experimental and nCTMC results, certain differences are found. Because of the existence of polarization and the nCTMC being unable to calculate the multi-electron correlation capture cross sections, the experimental results are greater than those of nCTMC at low velocities（ 1.7v0-2.0v0 ）. When the velocity of the projectile is higher（2.2 v0-4. 2 v0 ）, the captured electron＇s partial screening of the projectile, the electron-electron dynamic correlation and the effective charge are taken into account in interpreting the qualitative differences between theoretical and experimental results. In addition, the cross section rations of transfer ionization to single electron capture are presented and the mechanism of transfer ionization are discussed.