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3-dimensional arrangement atoms axis body-centred calculated centre of symmetry close-packed co-ordinates consider corresponding crystal face crystal structure crystal unit crystallography cube cubic lattice density diffracted beams direction distance electrons equally spaced equation example film Fourier series geometrical given glancing angle glide planes hexagonal holes incident beam integrated reflexion intensities ions kind large number lattice points Laue law of rational layer line measurements method molecules NaCl normal number of spectra obtained occur octahedron orthorhombic oxygen atoms parallel pattern perpendicular phase difference photograph positions possible to determine projection radiation rational indices rays reflexion planes right angles rock-salt rotation screw axes screw axis set of planes simple Sir William Bragg space-group space-lattice spectra spectrometer spectrum spots struc structure factors Suppose symmetry centre symmetry elements tetrahedra thermal movement three axes tion translations unit cell values W. L. Bragg wave wave-front wave-length X rays X-ray X-ray crystallography zero