Lecture 7: Systematic Absences
Conditions due to the existence of screw axes: Screw axis Reflection condition Reflections involved 2 1 h, kor l= 2n 4 2, 6 3 l= 2n h00 for axis ka 3 1, 3 2, 6 2, 6 4 l= 3n 0k0 for axis kb 4 1, 4 3 l= 4n 00lfor axis kc 6 1, 6 5 l= 6n Conditions due to the existence of glide planes (n.b. this list is not comprehensive for the d-glides):
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