2/m Point Group  Practical Electron Microscopy and Database   An Online Book  

Microanalysis  EM Book http://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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The notation '2/m' in point group 2/m denotes a twofold axis parallel to the normal to a mirror plane. The '/' symbol indicates parallel symmetry elements. Table 2982 list all the space groups which have point group 2/m. Table 2982. All space groups which have point group 2/m.
2/m is the only centrosymmetric monoclinic point group. For crystals with this point group, the combination of the twofold axis (unique axis b) and the mirror plane leads to two sets of intensities of four equivalent reflections which are I_{hkl} = I_{hkl} = I_{hkl} = I_{hkl} and I_{hkl} = I_{hkl} = I_{hkl} = I_{hkl}.


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