Open AccessMomentum image of emission electrons in transfer ionization process of slow He2+ colliding on He
Author(s) -
Wei Feng,
Xueli Ma,
Xiaolong Zhu,
Shaofeng Zhang,
Huiping Liu,
Shuyang Xu,
D B Qian,
Bin Li,
Yan Shun-Cheng,
Dacheng Zhang,
Meng Ling-Jie,
Pengju Zhang
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.8471
Subject(s) - atomic physics , physics , electron , amplitude , ionization , momentum transfer , projectile , scattering , momentum (technical analysis) , wave function , plane (geometry) , ion , optics , nuclear physics , quantum mechanics , finance , economics , geometry , mathematics
The velocity distribution of emission electrons in the transfer ionization process of 70keV He2+ colliding on He has been studied with a reaction microscope. These distributions show that the electrons lie mainly in the scattering plane which are observed to be emitted preferentially in the forward direction, lying between 0 and projectile velocity Vp. The distributions also display a typical two-fingered structure with a local minimum on internuclear axis. This characteristic can be qualitatively explained as being due to the interference between σ amplitude and π amplitude of electrons final wavefunction. It depends also on the impact parameters; the π amplitude contribution is dominant at small impact parameters, which leads to a symmetric velocity distribution around the internuclear axis. However, at large impact parameters the σ amplitude contribution increases relatively obviously, resulting in an asymmetric electrons velocity distribution around the internuclear axis.