  In this paper we present a fully ab initio Hartree-Fock approach aimed at
calculating the static structure factor of crystalline insulators at arbitrary
values of momentum transfer. In particular, we outline the computation of the
incoherent scattering function, the component of the structure factor which
governs the incoherent x-ray scattering from solids. The presented theory is
applied to crystalline LiF to obtain benchmark Hartree-Fock values for its
incoherent scattering function. Benchmark theoretical values such as this, can
be combined with the experimentally measured static structure factor, to
understand the influence of electron correlation effects on cohesive properties
of solids.
