Electron microscopy
 
-1 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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Table 2985 shows the space group which has point group -1.

Table 2985. All space groups which have point group -1.
Space Group Patterson Space Group Number of Symmetry Operators Crystal System Laue Class Lattice Type
P-1 2 2 Triclinic -1 P

The diffraction pattern from a triclinic crystal with the point group of -1 is centrosymmetric. Such crystals exhibit four pairs of reflections in intensity: Ihkl = I-h-k-l, I-hkl = Ih-k-l, Ih-kl = I-hk-l, and Ihk-l = I-h-kl. These reflection pairs are so-called Friedel pairs.

 

 

 

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