近完美晶体X射线统计动力学

STATISTICAL DYNAMICAL DIFFRACTION IN NEARLY PERFECT CRYSTALS

将Ｔａｋａｇｉ－Ｔａｕｐｉｎ方程的一种新的表述形式应用于近完美晶体中，得到存在随机分布的微小晶格畸变时，近完美晶体的衍射统计动力学方程。引出静态Ｄｅｂｙｅ－Ｗａｌｌｅｒ因子表征晶体的完美性，并得到Ｌａｕｅ衍射条件下一束窄的入射Ｘ射线在晶体中激发的波场的强度分布表达式；讨论了该表达式在研究晶体中ｎｍ数量级点状微缺陷方面的应用．

A new expression of Takagi-Taupin equations is applied to nearly perfect cry-stals with statistical lattice distortion, with which a formalism of the dynamical di-ffraction is proposed.A static Debye-Waller factor E is introduced to characterizethe crystal.A solution of the equations is presented which describe the intensitydistribution due to a narrow incident wave in the topography of a statistically ho-mogeneous crystal.The application of this theory to the measuring of the micro-defects in crystals is discussed.