Ag-BaO thin films have been fabricated by evaporating silver into BaO semiconductor thin film in ultrahigh vacuum and the quantum yield distribution in the visible region between 1.5 and 3.7 eV has been measured. The quantum yield spectra have a peak when the energy of the incident light is 2.5 eV. The direct transitions and surface plasmon resonance of silver nanoparticles appear to be very important in determining the shape of quantum yield spectra. The explanation for the small discrepancy between the experimental result and the theoretical data is given.

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