Vibronic spectrum ofGd3+in BeF2glass

Abstract

Vibronic sidebands associated with the ${}_{}{}^6{}_{}{}^{}P_{\frac{7}{2}}^{}{}_{}{}^{}\to {}_{}{}^8{}_{}{}^{}S_{\frac{7}{2}}^{}{}_{}{}^{}$ transition of ${\mathrm{Gd}}^{3+}$ in Be${\mathrm{F}}_2$ glass are observed with the use of line-narrowed fluorescence techniques. Comparison of the relative intensities of peaks in vibronic, polarized Raman, and infrared (${\epsilon }_2$) spectra demonstrate that different selection rules are operative. No variation of vibronic spectra with laser excitation wavelength was detected.