ON THE SHAPE OF THE RADIAL-DISTRIBUTION FUNCTION OF AN ASSEMBLY OF MONODISPERSE ELLIPSOIDAL SCATTERERS

It is well known that the small-angle scattering pattern of an assembl y of monodisperse ellipsoidal particles is equivalent to the one obtai ned from an assembly of polydisperse spherical scatterers. In this pap er, it is shown that the radial distribution function that one obtains from a system of monodisperse ellipsoids has a shape very different f rom that of any common size distribution function (Schulz, Gaussian, r ectangular,...) usually assumed for polydisperse systems. From a theor etical point of view, the scattering pattern arising from a system cha racterized by a small size anisotropy is distinct from that arising fr om one containing spherical particles with a narrow radii distribution but, experimentally, such a distinction can be made only when a subst antial deviation from a monodisperse spherical system is present.