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Physics
Atomic and Condensed Matter
Symmetries of a Diamond Unit Cell - Point Group Confusion
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[QUOTE="ngonyama, post: 6010506, member: 646938"] I believe diamond's space group is Fd3m that is F4sub1/d -3 2/m, not Fm3m like NaCl-type This is a non-symmorphic space group: it has fourfold [I]screw[/I] axes and diamond glides: symmetry elements that combine rotation with partial translation. For some properties like optical ones that does not matter and so this group resorts under point group m-3m. The actual space group may not have any position that has that point group symmetry because screw axes tend to cross each other rather than intersect. The inversion center may also not be where you'd expect it but somewhere between the crossing axes in open space rather than at the origin or the intersection of the axes. Look at the international tables [/QUOTE]
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Physics
Atomic and Condensed Matter
Symmetries of a Diamond Unit Cell - Point Group Confusion
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