Abstract
The cross section for X-ray inelastic scattering from crystals has been derived from first principles to explain the coexisting Compton and Raman scattering in solids. This derivation makes it possible to express the inelastic scattering cross section in terms of the current correlation of electrons in a crystal. The criterion for having a distinct Raman scattering is obtained through the dependence of the current correlation on the momentum transfer.