Charge transfer of oxygen negative ions scattering on dissociated H2O-covered Cu(1 1 0) surface

Charge transfer during oxygen negative ion surface scattering is performed to investigate the electronic interaction for the water/Cu system as a function of incident velocity. We find that both positive and negative ion fractions increase with incident velocity for the specular scattering condition...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2019-07, Vol.450, p.56-60
Main Authors: Liu, Pinyang, Shi, Yuanqing, Zhu, Yachao, Zhang, Xin, Li, Yin, Xiao, Yunqing, Ren, Fei, Gao, Lei, Guo, Yanling, Chen, Lin, Chen, Ximeng
Format: Article
Language:English
Subjects:
Charge transfer
Ion surface scattering
Negative ion
Water adsorption
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Summary:Charge transfer during oxygen negative ion surface scattering is performed to investigate the electronic interaction for the water/Cu system as a function of incident velocity. We find that both positive and negative ion fractions increase with incident velocity for the specular scattering condition. The positive ions produced close to the surface can be understood by the mechanisms of collision-induced ionization and Auger ionization, and they finally survive from the resonant and/or Auger neutralization, which are well described by the exponential scaling. The negative ions are formed through the resonant charge transfer, and the velocity dependence has been explained by the kinematically parallel velocity effect and the surface work function. The modified rate equation taking into account these two factors is in rough agreement with the experimental result.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2018.09.037