4mm Point Group  Practical Electron Microscopy and Database   An Online Book  

Microanalysis  EM Book https://www.globalsino.com/EM/  


This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.  
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Table 3003 list all the space groups which have point group 4mm. Table 3003. All space groups which have point group 4mm.
In 4mm, σ_{1} and σ_{3} are related by the 90° rotation of 4fold axis as shown in Figure 3003a. There are two obvious sets of mirror planes which are σ_{1}/σ_{3} and σ_{2}/σ_{4}. These two sets are not equivalent as the operation of the rotation axis will never match the two sets to the same location. Therefore, this is group 4mm. Figure 3003a. 4mm point group.


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