Direct methods: the identification of conditions which simplify the generation of inconsistent quadrupoles.
Direct methods: the identification of conditions which simplify the generation of inconsistent quadrupoles.
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直接方法：识别简化不一致四极杆生成的条件。
DOI：
10.1107/s0108767388003435
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
Han,F
中科院分区：
文献类型：
--
作者：
Langs,DA;Han,F
实现了一个算法来确定不一致的II型四极杆的形状和相移，对于任何具有滑移或螺旋轴平移的空间群，这些平移不是晶格中心的结果。累积起来，只有六种不同的米勒折射率限制和九种不同的相移形式对于所有正交或较低对称性的空间群是共同的。对新发现的III型四极杆也进行了类似的分析。III型四极杆的四个三元组之间的相位连接的配置不同于前面针对正常(类型I)和不一致(类型II)的四极杆所描述的常见配置。了解II型和III型四极杆的这些约束条件极大地简化了生成这些关系的过程。
An algorithm is implemented to determine the form and phase shift for inconsistent type II quadrupoles for any space group having glide or screw-axis translations which are not a consequence of lattice centering. Cumulatively there are only six different Miller index restrictions and nine different phase shift forms common to all space groups of orthorhombic or lower symmetry. A similar analysis has been performed for a newly discovered type III class of quadrupoles. The configuration of the phase connections among the four triples of the type III quadrupole is different from the common configuration previously described for both normal (type I) and inconsistent (type II) quadrupoles. A knowledge of these constraint conditions for type II and III quadrupoles greatly simplifies a procedure for generating these relationships.