Introduction to the Space Groups |
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a(hkl a₁ a₂ b₁ b₂ C₂ calculation cell of type centre of symmetry co-ordinates coefficients column complete matrix corresponding cosine crystallographic deduced digonal axis digonal screw distance elementary cell equivalent points example extinction rules F(hkl Fmmm follows form hkl form of equivalent formula Fourier series function glide component glide plane glide translation half-periods Harker-lines Harker-matrix Harker-points HM symbol ī 1 ī ī ī indicated International Tables give intersection matrix metry mirror monoclinic N₁ Niggli occur odd number orientations ortho-rhombic P(hkl p(xyz P₁ parallel parallelepiped passes the origin Pban periodic function plane hkl plane of symmetry Pmmm Pnna Q(hkl reader represented resp screw axes shifting space groups D2 structure factor sub-groups suite hkl symmetry centre symmetry elements symmetry planes triclinic unit cell x y z Y₂ zero α₁ α₂ אן אן