中国物理B ›› 2006, Vol. 15 ›› Issue (11): 2651-2656.doi: 10.1088/1009-1963/15/11/032

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Mutual recombination in slow Si+ + H- collisions

王建国1, 刘春雷1, 颜君1, JanevR.K.2, 施建荣3   

  1. (1)Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; (2)Macedonian Academy of Sciences and Arts, P.O.B. 428, 1000 Skopje, Macedonia; (3)The National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
  • 收稿日期:2006-02-14 修回日期:2006-02-17 出版日期:2006-11-20 发布日期:2006-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10574018 and 10574020).

Mutual recombination in slow Si+ + H- collisions

Wang Jian-Guo(王建国)a), Liu Chun-Lei(刘春雷)a), Janev R. K.b), Yan Jun(颜君)a), and Shi Jian-Rong(施建荣)c)   

  1. a Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; b Macedonian Academy of Sciences and Arts, P.O.B. 428, 1000 Skopje, Macedonia; c The National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
  • Received:2006-02-14 Revised:2006-02-17 Online:2006-11-20 Published:2006-11-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10574018 and 10574020).

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摘要： This paper studies the process of mutual neutralization of Si\sj{+} and H\sj{-} ions in slow collisions within the multi-channel Landau--Zener model. All important ionic-covalent couplings in this collision system are included in the collision dynamics. The cross sections for population of specific final states of product Si atom are calculated in the CM energy range 0.05\,eV/u--5\,keV/u. Both singlet and triplet states are considered. At collision energies below $\sim$10\,eV/u, the most populated singlet state is Si(3p4p, \sj{1}$S_0$), while for energies above $\sim$150\,eV/u it is the Si(3p, 4p, \sj{1}$P_1$) state. In the case of triplet states, the mixed 3p4p(\sj{3}$S_1$+\sj{3}$P_0$) states are the most populated in the entire collision energy range investigated. The total cross section exhibits a broad maximum around 200--300\,eV/u and for $E_{\rm CM}\leq$ 10\,eV/u it monotonically increases with decreasing the collision energy, reaching a value of $8\ti10^{-13}$\,cm\sj{2} at $E_{\rm CM}$ = 0.05\,eV/u. The ion-pair formation process in Si(3p\sj{2} \sj{3}$P_{\rm J}$)+H(1s) collisions has also been considered and its cross section in the considered energy range is very small (smaller than 10\sj{-20}\,cm\sj{2} in the energy region below 1\,keV/u).

关键词: multi-channel Landau--Zener model, slow collision, mutual neutralization

Abstract: This paper studies the process of mutual neutralization of Si+ and H- ions in slow collisions within the multi-channel Landau--Zener model. All important ionic-covalent couplings in this collision system are included in the collision dynamics. The cross sections for population of specific final states of product Si atom are calculated in the CM energy range 0.05 eV/u--5 keV/u. Both singlet and triplet states are considered. At collision energies below $\sim$10 eV/u, the most populated singlet state is Si(3p4p, 1$S_0$), while for energies above $\sim$150 eV/u it is the Si(3p, 4p, 1$P_1$) state. In the case of triplet states, the mixed 3p4p(3$S_1$+3$P_0$) states are the most populated in the entire collision energy range investigated. The total cross section exhibits a broad maximum around 200--300 eV/u and for $E_{\rm CM}\leq$ 10 eV/u it monotonically increases with decreasing the collision energy, reaching a value of $8\times10^{-13}$ cm2 at $E_{\rm CM}$ = 0.05 eV/u. The ion-pair formation process in Si(3p2 3$P_{\rm J}$)+H(1s) collisions has also been considered and its cross section in the considered energy range is very small (smaller than 10-20 cm2 in the energy region below 1 keV/u).

Key words: multi-channel Landau--Zener model, slow collision, mutual neutralization

中图分类号:  (Interactions of atoms and molecules with surfaces)

  • 34.35.+a
34.20.-b (Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions) 34.70.+e (Charge transfer) 82.30.Fi (Ion-molecule, ion-ion, and charge-transfer reactions)