Absolute Differential Cross Sections of Elastically Scattered Electrons. I. He, N2, and CO at 500 eV

Abstract

An electron spectrometer especially designed for the study of elastic scattering has been constructed and used to measure absolute differential elastic cross sections of 500-eV electrons scattered from He, CO, and N2. Comparison with calculated values for He indicates that the first Born approximation with exchange gives results which agree with experiment to within 2% at angles greater than 18°. At small angles the observed cross sections exceed the calculated by a large factor. The cross sections for N2 and CO change with angle in very similar ways.