Coulomb Scattering without Atomic Excitation for 50-, 100-, 200-, and 400-keV Electrons

Cross sections for the single scattering without atomic excitation of 50-, 100-, 200-, and 400-keV electrons from thin targets of gold, tin, and copper are experimentally determined at angles ranging from 20 to 110 deg. These experimental cross sections show good agreement with the Lin, Sherman, and Percus phase-shift calculations for the Mott exact cross section, which was evaluated with an approximate Hartree screening potential for gold and copper. On the other hand, the experimental results show appreciable differences from Born cross section calculations containing Molière screening, particularly for the lowest electron kinetic energy (50 keV) and the largest atomic number (79) and for the region where the momentum transfer to the nucleus (in $m_{0}c$ units) is less than unity.