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Crystal Systems and Space Groups - McMaster University
www.chemistry.mcmaster.caIn this lecture we will be using (hkl) and [hkl] often . Understanding Hermann-Mauguin Notation for Point Groups Crystal System 1st Position 2nd Position 3rd Position Point Groups Triclinic Only one position, denoting all directions in crystal 1, 1 ... Causes systematic absences in
Lecture 7: Systematic Absences
goodwin.chem.ox.ac.ukConditions 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):