Cross section of the impact single ionization of B^(2+) by H^+  

作　　者：叶丹丹 祁月盈 胡亚华 宁丽娜 

机构地区：[1]College of Mathematics,Physics and Information Engineering,Jiaxing University

出　　处：《Chinese Physics B》2013年第5期272-278,共7页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China (Grant No. 2013CB922200);the National Natural Science Foundation of China (Grant Nos. 11005049, 11025417, 10979007, and 10974021)

摘　　要：The ionization process of B2＋ by H＋ impact is studied using the continuum-distorted-wave eikonal-initial-state （CDW-EIS） method and the modified free electron peak approximation （M-FEPA）, respectively. Total, single-, and double- differential cross sections from ls and 2s orbitals are presented for the energy range from 10 keV/u to 10 MeV/u. Com- parison between the results from the two methods demonstrates that the total and single-differential cross sections for the high-energy incident projectile case can be well evaluated using the simple M-FEPA model. Moreover, the M-FEPA model reproduces the essential features of the binary-encounter （BE） bump in the double-differential cross sections. Thus, the BE ionization mechanism is discussed in detail by adopting the M-FEPA model. In particular, the double- and single- differential cross sections from the 2s orbital show a high-energy hip, which is different from those from the ls orbital. Based on Ref. [1], the Compton profiles of B2＋ for ls and 2s orbitals are given, and the hips in DDCS and SDCS from the 2s orbital are explained.The ionization process of B2＋ by H＋ impact is studied using the continuum-distorted-wave eikonal-initial-state （CDW-EIS） method and the modified free electron peak approximation （M-FEPA）, respectively. Total, single-, and double- differential cross sections from ls and 2s orbitals are presented for the energy range from 10 keV/u to 10 MeV/u. Com- parison between the results from the two methods demonstrates that the total and single-differential cross sections for the high-energy incident projectile case can be well evaluated using the simple M-FEPA model. Moreover, the M-FEPA model reproduces the essential features of the binary-encounter （BE） bump in the double-differential cross sections. Thus, the BE ionization mechanism is discussed in detail by adopting the M-FEPA model. In particular, the double- and single- differential cross sections from the 2s orbital show a high-energy hip, which is different from those from the ls orbital. Based on Ref. [1], the Compton profiles of B2＋ for ls and 2s orbitals are given, and the hips in DDCS and SDCS from the 2s orbital are explained.

关 键 词：continuum-distorted-wave eikonal-initial-state （CDW-EIS） method modified flee electron peakapproximation （M-FEPA） binary-encounter （BE） bump Compton profile 

分 类 号：O562[理学—原子与分子物理]