原子吸收限附近完整晶体内的能流方向  

DIRECTION OF THE ENERGY FLOW IN PERFECT CRYSTALS NEAR THE ATOMIC ABSORPTION EDGE

作　　者：徐章程[1] 郭常霖[1] 赵宗彦[2] 周圣明[2] 深町共荣 根岸利一郎 

机构地区：[1]中国科学院上海硅酸盐研究所 [2]安徽大学物理系 [3]日本琦玉工业大学电子工学科

出　　处：《物理学报》1997年第11期2188-2197,共10页Acta Physica Sinica

基　　金：国家自然科学基金;安徽省自然科学基金

摘　　要：研究了原子吸收限附近对称劳厄和布拉格情况下完整晶体内的能流方向．发现在对称劳厄情况下，只有当原子散射因子的虚部对衍射的贡献可以与实部的贡献相比较时，晶体内与色散面上某一结点相对应的能流会偏离色散面的实部的法向；而在对称布拉格情况下，即使在原子散射因子的虚部对衍射的贡献可以忽略时，在所谓的“全反射”区内也会偏离．当衍射仅由原子的虚部引起时，这种偏离在对称劳厄情况下最大，而在对称布拉格情况下最小．Abstract The direction of the energy flow in perfect crystals near the atomic absorption edge is studied in detail in the symmetrical Laue and Bragg cases. It is found that in the symmetrical Laue case, the direction of the energy flow corresponding to a tie point on the dispersion surface deviates from the normal of the real part of the dispersion surface, only when the contribution of the imaginary part of the atomic scattering factor to the diffraction is comparable to that of the real part. However, in the symmetrical Bragg case, the deviation takes place in the so called “total reflection” region even when the contribution of the imaginary part of the atomic scattering factor to the diffraction is negligible. When diffraction is induced only by the imaginary part of the atomic scattering factor, the deviation becomes the largest in the Laue case, but the least in the Bragg case.

关 键 词：色散面 能流 完整晶体 原子吸收限 晶体 

分 类 号：O734.1[理学—晶体学]