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基于心射投影和旋转倒易坐标系.提出了一个绘制各种投影图和衍射谱的计算机方法,导出了相应的公式,编排了计算机程序(采用BASIC语言).本法的优点是同一程序可用来绘制极射和心射投影图、X射线Laue谱、电子衍射谱等.此外,该程序还可用来绘制各种复杂图谱,如孪晶图谱、高阶电子衍射谱等.利用这些图谱可以方便、迅速地进行各种晶体分析工作,例如确定晶体的对称性、分析任意倒易截面上的结点分布、标定X射线和电子衍射谱以及研究基体和孪晶的位向关系、确定孪晶的类型等.本程序适用于任意晶系和任意参数(任意基圆半径、照相距离或仪器常数).本程序实际应用表明,其结果是令人满意的.

Based on the gnomonic projections and on the rotational reciprocal coordi-nate axes,a computer program,written in BASIC,is compiled for the simulationof various kinds of projections and diffraction patterns of crystals.These includethe standard gnomonic and stereographic projections,the transmission and back-reflection Laue patterns and the electron diffraction patterns.The projections anddiffraction patterns of both matrix and twin can be drawn together.In the caseof electron diffraction,the pattern may contain spots on any reciprocal layer be-sides the zero one.It is shown that these projections and patterns can be conve-niently used for the indexing of the diffraction spots and the determination of thecrystal symmetry,the type of the twin and the orientation relationship betweenmatrix and twin.