Studies of the vibronic interaction between Eu3+ ions and glass-forming units in oxide glasses

Vibronic spectra involving intramolecular vibrations of glass-forming units have been measured for the f–f transitions of Eu3+ ions doped into sodium germanate and sodium silicate glasses. It is shown, from the analysis of relative intensities of these spectra, that the interaction of the Eu3+ ion with the vibrations of the surrounding forming units of oxide glasses is well described by the electric multipole–multipole interaction.