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Momentum image of emission electrons in transfer ionization process of slow He2+ colliding on He

Ma Xin-Wen Zhu Xiao-Long Liu Hui-Ping Qian Dong-Bin Zhang Da-Cheng Feng Wen-Tian Zhang Shao-Feng Xu Shen-Yue Li Bin Yan Shun-Cheng Meng Ling-Jie Zhang Peng-Ju

Momentum image of emission electrons in transfer ionization process of slow He2+ colliding on He

Ma Xin-Wen, Zhu Xiao-Long, Liu Hui-Ping, Qian Dong-Bin, Zhang Da-Cheng, Feng Wen-Tian, Zhang Shao-Feng, Xu Shen-Yue, Li Bin, Yan Shun-Cheng, Meng Ling-Jie, Zhang Peng-Ju
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  • Received Date:  29 January 2010
  • Accepted Date:  11 June 2010
  • Published Online:  05 June 2010

Momentum image of emission electrons in transfer ionization process of slow He2+ colliding on He

  • 1. (1)Insititute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; (2)Insititute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Abstract: 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.

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