Abstract
Abstract The intensity of electron-induced photon emission from Ag films of various thicknesses on W(110) has been measured as a function of the energy of the incident electrons, the emitted photons being detected in two narrow spectral intervals at ℏω 1 = 3.83 eV and ℏω 2 = 3.08 eV. The threshold for photon emission was found to the E p = 0 eV for both wavelengths. The measured isochromat spectra are compared to the total current spectra. Minima at E 1 = 16.5 eV and E 2 = 20 eV above the Fermi level are thought to correspond to an increase of the electron reflection from the sample surface at these energies. At the same time the maximum in the ℏω = 3.08 eV isochromat spectrum at E = 6.5 eV above the Fermi level is due to the dominating radiative capture to states at E = 3.4 eV above the Fermi level. The spectral distribution ofintensity of the electron-induced photon emission was obtained for Ag films of various thicknesses at the electron energy E p = 0 eV above the vacuum level.
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