Charge-transfer and impact-ionization cross sections for fully and partially stripped positive ions colliding with atomic hydrogen
Charge-transfer and impact-ionization cross sections for fully and partially stripped positive ions colliding with atomic hydrogen
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DOI：
10.1103/physreva.16.531
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发表时间：
1977-08
影响因子：
2.9
通讯作者：
R. Olson;A. Salop
中科院分区：
文献类型：
--
作者：
R. Olson;A. Salop
本文用经典轨道计算方法计算了A/sup +//sup q/ + H碰撞的电荷转移截面和碰撞电离截面，速度范围为（2- 7）× 10 ~（-8）cm/sec。计算采用三维蒙特卡罗方法，该方法使用H原子的经典描述和所有粒子之间的库仑力来获得横截面。研究的正离子包括完全剥离的A/sup +//sup q/，q = 1- 8、10、14、18、26和36，以及部分剥离的B/sup +//sup q/、C/sup +//sup q/、N/sup +//sup q/和O/sup +//sup q/，q >或= 3。总的电子损失截面（电荷交换和碰撞电离的总和）对于较高的电荷状态仅随速度略有变化，并且对于Kr/sup +36/ + H碰撞达到2 x 10/sup-14/ cm/sup 2/。碰撞电离相对于电荷转移的重要性被发现在研究的速度范围内随着q的增加而降低。给出了H/sup +/ + H和Ar/sup +18/ + H反应的跃迁几率与碰撞参数的关系。计算结果与实验测量的H/sup +/、C/sup +/sup q/、more » N/sup +//sup q/和O/sup +//sup q/ + H体系的截面相当吻合。«少
Classical trajectory calculations have been used to predict the charge-transfer and impact-ionization cross sections for collisions of A/sup +//sup q/ + H in the velocity range of (2--7) x 10/sup 8/ cm/sec. The calculations employ a three-dimensional Monte Carlo approach that uses a classical description of the H atom and the Coulomb forces among all particles to obtain the cross sections. The positive ions studied include fully stripped A/sup +//sup q/, with q = 1--8, 10, 14, 18, 26, and 36, and partially stripped B/sup +//sup q/, C/sup +//sup q/, N/sup +//sup q/, and O/sup +//sup q/, with q > or = 3. The total electron-loss cross sections (sum of charge exchange and impact ionization) vary only slightly with velocity for the higher charge states and reach a value of 2 x 10/sup -14/ cm/sup 2/ for Kr/sup +36/ + H collisions. The importance of impact ionization relative to charge transfer is found to decrease with increasing q in the velocity range studied. Transition probabilities versus impact parameters are presented for the H/sup +/ + H and Ar/sup +18/ + H reactions. The calculations are in reasonable agreement with experimentally measured cross sections for the H/sup +/, C/sup +//sup q/,more » N/sup +//sup q/, and O/sup +//sup q/ + H systems.« less