| Summary: | The energy and angular distributions of low energy electrons « 400 eV) inelastically scattered from a clean copper surface have been determined in the neighbourhood of the specularly reflected beam. The intensity of these electrons is strongly influenced by elastic diffraction from the lattice. In certain circumstances the relationship between the elastic and inelastic cross-sections can be explained in terms of a simple, kinematical theory developed by C. B. Duke and others. This theory, however, is inadequate when multiple diffraction is pronounced. The angular distribution in scattered intensity is insensitive to the diffracting conditions and can not be explained in terms of simple models. The complexity of the electronic structure of copper surfaces is emphasized
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