## X-ray Crystallography |

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### Contents

CHAP PAGE | 1 |

THE CRYSTAL LATTICE AS A DIFFRACTION GBATINQ | 12 |

in THE SYMMETRY OF CRYSTALS AND ITS DETERMINA | 34 |

4 other sections not shown

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### Common terms and phrases

2-fold axes 3-dimensional amplitude scattered arrangement atoms axes at right calculated centre of symmetry Cl atoms close-packed co-ordinates consider corresponding crystal face crystal method crystal structure crystal unit cube diffracted beams dimensions distance equally spaced example face-centred cubic formula geometrical given glancing angle glide planes hexagonal holes incident beam incident wave ionic ions large number lattice planes lattice points Laue layer measured method metry Miller indices molecule NaCl normal number of spectra obtained occur octahedron orthorhombic oxygen atoms parallel path difference pattern perpendicular phase difference positions primitive translations radiation ratio rays reflected reflexion planes regular right angles rock-salt rotation photograph rows of points screw axis set of planes similar simple small whole numbers space-group space-lattice spectrometer spectrum Suppose symmetry centre symmetry elements three axes total number unit cell unit of structure values W. L. Bragg wave-front wave-length wavelets X rays X-ray crystallography zero zero-point energy