Abstract
A phase-shift analysis of electron-helium elastic scattering in the energy range 31 to 191 ev has been made. s- and p-wave phase shifts consistent with the dispersion relation and with experimental information on the total elastic scattering cross section, the diffusion cross section and recent measurements of the differential cross section, to within 5% are obtained. The Gibson-Dolder measurements of the differential scattering cross section are shown to be theoretically preferable to the earlier measurements of Ramsauer and Kollath. The d-wave phase shift cannot be determined to better than 25% by available experimental information. The phase shifts obtained are consistent with, but do not distinguish between, recent non-adiabatic theoretical calculations, but exclude the simple polarized orbital model. They satisfy Spruch bounds based on the experimental polarizability and yield a scattering length of 11a0 in agreement with other determinations.
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