Quadrupole Resonance in Chloranil

PREVIOUS papers1 in this series have dealt with (a) the evaluation of radial wavefunctions, phase shifts, reduced phases, and differential elastic cross sections for scattering by a L-J (12, 6) potential; (b) the resulting velocity dependence of the differential and total scattering cross sections, with attention given to the Jeffreys-Born OB) approximation for the higher-order phases; (c) the applicability of the semiclassical equivalence principle to the calculation of the phase shifts from the classical deflection function; and (d) an analysis of the undulatory velocity dependence of the total cross section in terms of bound states. The present paper presents an explicit treatment of the velocity dependence of the JB phases and the total elastic scattering cross sections in the highvelocity region (e.g., in the e V -energy range) for molecules interacting according to the L-J (n, 6) and exp-6(a) potentials. A criterion is given for estimating