Role of projectile energy and surface work function on charge transfer of negative ions grazing scattering on dissociated H2O-covered Cu(110)
Role of projectile energy and surface work function on charge transfer of negative ions grazing scattering on dissociated H2O-covered Cu(110)
复制标题
抛射能量和表面功函数对离解 H2O 覆盖的 Cu(110) 上负离子掠射电荷转移的作用
DOI：
10.1016/j.apsusc.2017.09.246
复制
发表时间：
2018-01
影响因子：
6.7
通讯作者：
Ximeng Chen
中科院分区：
文献类型：
--
作者：
Lei Gao;Yachao Zhu;Yuanqing Shi;Pinyang Liu;Yunqing Xiao;Fei Ren;Lin Chen;Yanling Guo;Ximeng Chen
Shifted Fermi sphere model and parallel velocity effects on clean metals have been verified by a number of previous studies. However, for fast F−and Cl−ions scattering on dissociated water covered Cu(110) at grazing incidence, the negative-ion fraction is projectile dependent and monotonically increases with the increase of impact velocity, which cannot be explained by the conventional parallel velocity effect. The positive-ion fraction increases with the increase of perpendicular velocity, which can be well described by the exponential scaling. Positive ions efficiently formed at large perpendicular velocities strongly suppress the negative ion yield at short distances from the surface, so that negative ions are only formed at large distances. In addition, the large surface work function further promotes a transition between two kinds of parallel velocity effects. The calculation taking into account these contributions is in rough agreement with the experimental data.
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DOI：
10.1016/0168-583x(91)95872-b
发表时间：
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影响因子：
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作者：
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通讯作者：
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