On the analysis of small-angle scattering with elliptical azimuthal symmetry

Inhomogeneities which have azimuthal symmetry around some unique axis exhibit small-angle neutron scattering with elliptical symmetry. It is not necessary that these inhomogeneities have an ellipsoidal shape. The model of Debye et al. has been generalized to incorporate an anisotropic correlation length having this symmetry. A method is given for fitting two-dimensional intensity data to this model. This is illustrated by data taken for sections of slate and shale rock cut normal to the direction of the bedding planes, and which exhibit both large- and small-pore anisotropies.