Differential Cross Sections for Elastic and Inelastic Scattering of Electrons by Atoms. Part of a Coordinated Programme on Energetic Particle Interactions with Materials of Importance to Fusion Reactors. Final Report for the Perio

摘要

Incoherent scattering function for case of simple translation of center of mass and the random torsional oscillations of the rigid body along the long molecular axes of an amplitude phi sub 0 , of perfectly ordered molecules in nematic phase, has been calculated. The model of a random molecular torsional motion is built on the assumption that each proton in the molecule suffers a large number of equal angular displacements between two perfectly reflecting barriers at phi sub 0 and -phi sub 0 . The dynamics of molecular tail has been described by uniaxial free rotational diffusion and freely rotating spherical top models, respectively. The predictions of the calculations are tested on measured time of flight spectra, obtained on three members of a homologous series of cholesteric liquid crystals and agreement is obtained. (Atomindex citation 11:550172)