X-RAY REFLECTIVITY OF BENT PERFECT CRYSTALS IN BRAGG AND LAUE GEOMETRY

被引：88
|
作者：
EROLA, E
ETELANIEMI, V
SUORTTI, P
PATTISON, P
THOMLINSON, W
机构：
[1] UNIV HELSINKI,DEPT PHYS,SILTAVUORENPENGER 20D,SF-00170 HELSINKI 17,FINLAND
[2] SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND
[3] BROOKHAVEN NATL LAB,NSLS,UPTON,NY 11973
来源：
JOURNAL OF APPLIED CRYSTALLOGRAPHY | 1990年 / 23卷
关键词：
D O I：
10.1107/S0021889889010800
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The X-ray reflectivity of bent perfect crystals is calculated from a model where the crystal is approximated by a stack of perfect-crystal lamellae which have a gradually changing orientation. A computer program is developed for calculation of the reflectivity of the composite crystal from the dynamical theory of diffraction. An approximate solution is also given where an analytical formula for the reflectivity of a non-absorbing lamella is used and the effects of absorption are calculated separately. Typically, in the Bragg case, the reflectivity curve has a steep edge and an exponentially falling slope, while in the Laue case the curve is almost rectangular if the absorption is not too large.
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收藏
页码：35 / 42
页数：8
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