[請益] 鑽石的space group 代號
我目前可以查到是F d 3 m
命名規則有查wiki http://en.wikipedia.org/wiki/Hermann-Mauguin_notation
跟一個REF http://www.ruppweb.org/xray/comp/space_instr.htm
也有鑽石結構的圖了 http://cst-www.nrl.navy.mil/lattice/struk/a4.html
可是我搞不懂他的 3 m
從Ref第四點
An inversion (shown by the bar above the axis) is entered as a minus sign.
Example : R -3 C. The exception is the triade in the cubic systems, which is
automatically recognized as an inversion in the centrosymmetric groups and
thus can be omitted: F D 3 M is ok, and so is F d -3 m.
所以這裡的 3 應該是 3 bar 是指 有inversion的 3mmm?
還是他的inversion 有什麼3的對稱性?
PS 鑽石的inversion 要從哪看阿 cell裡那四顆 就已經不像了耶
有請高手幫忙
謝謝
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