Radiation from Thick Silver Foils Bombarded by Grazing-Incidence Electrons

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Abstract
Silver foils several thousand angstroms in thickness were bombarded by electrons at grazing incidence. A peak was observed at approximately 3550 Å in the optical emission spectrum. For an angle of incidence of 89° from the foil normal, the peak intensity was approximately ten times as great as that of previously observed intensities of transition radiation at 3300 Å from silver foils bombarded with normally incident electrons. The intensity was found to be directly proportional to the electron energy from 40 to 80 keV, and showed a marked dependence on the quality of the foil surface. The results are in agreement with the findings of Boersch et al.