Intensity of diffracted intensities

摘要: Section 6.1.1 covers X-ray scattering from atoms and ions. Scattering is described by the Thomson formula, including coherent (Rayleigh) incoherent (Compton) scattering. Atomic factors, calculated using relativistic Hartree–Fock or Dirac–Slater wavefunctions, give an atom (in fact, its ensemble of electrons) in terms that a single electron. Free-atom factors are tabulated for neutral atomic number 1 (hydrogen) to 98 (californium) over range sin θ/λ 0 6 A−1, ions H1− Pu6+ 2 A−1. Analytical fits given methods interpolation described. Perturbations free-atom electron density bound handled with generalized expressed as spherical harmonics. Probability functions displacement due temperature related vibration symmetries. The final parts describe role computation crystal structure summation unit-cell atoms, reflecting power small crystals. 6.1.2 presents basic equations governing magnetic neutrons. They used define useful intermediate quantities interaction vector, factor form factor, which calculations cross sections. A brief account way depends upon neutron spin direction (neutron polarization) included. Formulae neutrons nuclei 6.1.3. sections nucleus, element containing mixture isotopes, considered.