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An energy loss peak at 2 eV in the energy spectrum of electrons transmitted through thin copper films is observed and the variations of the energy value and of the intensity of the peak with film thickness are studied. The cross section for the surface plasmon excitation is calculated from optical data. The observed variations of the energy value and of the intensity of the peak show quantitative and qualitative agreements, respectively, with calculated values. It is concluded that the peak is mainly due to the surface plasmon which does not emit plasma radiation.
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Takigawa et al. (1973) studied this question.
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