DIFFERENTIAL CROSS-SECTIONS FOR ELASTIC-SCATTERING OF INTERMEDIATE-ENERGY ELECTRONS FROM SODIUM

Differential cross sections for the elastic scattering of electrons from sodium have been measured with high angular resolution for incident energies of 54.4, 75, 100 and 150 eV and over an angular range of 12-140 degrees . The experimental data are compared with calculations based on the first Born approximation, the Glauber approximation and a close-coupling impact-parameter calculation. Calculations have been carried out for an optical model using the prescription of Vanderpoorten (1976) for localising the absorptive part of the potential. The optical model is found to reproduce best the general features of the cross section at all energies.