“Angular Distribution of Electrons Suffering Characteristic Energy Loss in Passage through Metal Films”

The distribution in energy and angle of 20–25 kv electrons scattered by Al, Ag and Au evaporated films was measured with an electron velocity analyser of Möllenstedt type. The energy resolution is about 5×10 -5 , and the angular resolution better than 5×10 -4 radian. The angular distribution of the characteristic energy loss was compared with Ferrell's calculation. (Phys. Rev. 101 ('56) 554). The comparison shows that the experimental result is consistent with a simple Bohm-Pines' approach provided that a correction is made for finite resolution of both energy and angle.