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A(km absorption amplitude-phase diagram aperture approximation atom plane atomic scattering factors axes body-centred Bragg angle Bravais lattices coefficients considered const constant convolution cos2 cosine series crystal lattice cubic lattice defined depend difference between waves diffracted wave diffraction grating diffraction pattern direction displacement distance electrons elements of area Fourier Fraunhofer Fraunhofer diffraction Fresnel diffraction Fresnel integrals Fresnel zone Geometry half-period zones illustrated in Fig incident beam incident wave infinite grating integrated intensity intensity distribution lattice planes neutron diffraction normal number of atoms number of unit obliquity factor origin orthorhombic periodic function phase difference plane of atoms plane wave primitive unit cell principal maxima reciprocal lattice point resultant amplitude scattered wave scattering centres scattering power screen secondary wavelets set of planes shown in Fig sin2 single slit spectra spherical wave strip structure factor transform triclinic wave scattered wave vector wavefront wavelength wavelets X-rays zero