SCATTERING CROSS SECTIONS IN ARGON FROM ELECTRON TRANSPORT PARAMETERS.

Abstract

Previously determined experimental drift velocities upsilon //d//r and ratios of lateral diffusion coefficient to mobility D//t/ mu have been refitted directly with a three parameter modified effective range theory (MERT) representation of the S wave phase shift, a one parameter fit to the P wave phase shift and fixed higher partial wave phase shifts. The MERT representation now extends to 1. 0 eV, a threefold extension of the energy range of the MERT fit reported by H. B. Milloy et al. (1977). The total cross section derived from the phase shifts is also reported, together with the differential cross section at 1. 0 eV which is compared with a previous experimental determination.