Introduction to the Space Groups |
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a(hkl a₁ a₂ assemblage B₁ b₂ belonging calculation cell of type centre of symmetry co-ordinates coalescences coefficients column complete matrix corresponding cosine crystal form crystallographic deduced digonal axis digonal screw distance easily elementary cell equivalent points example extinction rules F(hkl Fmmm follows form hkl form of equivalent formula Fourier series glide component glide plane glide translation H M symbol half-periods Harker-lines Harker-matrix Harker-points ī 1 ī ī ī indicated International Tables give metry mirror monoclinic N₁ Niggli occur odd number orientations ortho-rhombic P(hkl p(xyz parallel parallelepiped passes the origin Pban periodic function plane hkl plane of symmetry Pnna primitive Q(hkl reader represented resp screw axes shifting space group structure factor sub-groups symmetry centre symmetry elements symmetry planes triclinic triplets unit cell vectors x y z Y₁ zero α₂