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中国物理学会期刊

氢离子在固体表面掠角散射与能量损失的数值模拟

CSTR: 32037.14.aps.48.1275

GRAZING SCATTERING AND ENERGY LOSS OF H+ MOVING NEAR A SOLID SURFACE

CSTR: 32037.14.aps.48.1275
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  • 利用介电响应理论和镜像反射模型对氢离子在固体表面掠角散射和能量损失进行了数值模拟.离子在表面散射时同时受到表面上原子的库仑排斥作用和表面电子气的动力学相互作用,后者是表面电子受运动的正离子扰动所产生,用线性介电响应理论来确定.在高速和低速情况下,分别采用仅与频率有关的局域介电函数和局域场修正介电函数来确定表面电子气产生的动力学相互作用力.计算结果与实验结果作了比较.发现入射速度很低时能量损失随入射角度变化不太明显,而当速度很高时能量损失随入射角度的变大而有所增加.

     

    The scattering trajectory and stopping power for H+ ions at glancing angles of incidence on a solid surface have been investigated using the dielectric response theory and specular reflection model. When an ion moves near the solid surface, it will be subjected to the repulsive force of the surface atoms and the dynamical force yielded by the surface induced potential. A local-field correction dielectric function and a local frquency-dependent dielectric function with a damping factor have been adopted respectively in low and high velocity approximations. The energy loss is obtained and has been compared with the experiment results.

     

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