Affinement de la partie centrale de la fonction de distribution radiale P(r)

The resolution of interatomic distances obtained from the radial distribution function, P(r), is discussed in the case of poorly crystallized organic compounds. In addition to the application of the Warren method (fluorescent selective re-emission), a solution is proposed to increase considerably the efficiency of the experimental device. At the same time, a method is explained for the determination of the absolute scale of the recorded intensities, allowing for removal of the extraneous peaks from the P(r) function. By using these methods for polyethylene, it is shown that the precision of 0.01 Å, obtained for the short interatomic distances, is comparable with that obtained from classical structural analysis.