The elastic scattering of electrons from argon

Abstract

Measurements are reported of angular distributions for electrons elastically scattered from argon in the energy range from 15 eV to 200 eV. A modulated crossed beam technique was employed and an angular resolution of about 3 degrees realized in the range 20 degrees -140 degrees . The results agree well with those of previous workers at the high energies but it is observed that the dynamic range of the present results is far greater at the intermediate and lower energies. Angular distributions have been calculated using a semiphenomenological optical model and find good agreement with the experimental data down to 30 eV. The recent relativistic calculations of Walker (1971) are in good agreement with the data over the whole energy range. The measured relative dependence with energy of the differential cross section at 30 degrees is compared with theory and a previous experiment.