Two-photon excitations of the $f\to f$ transitions in ${\mathrm{Eu}}^{2+}$-doped KCl have been studied. The splitting of the ${}_{}{}^8{}_{}{}^{}S_{\frac{7}{2}}^{}{}_{}{}^{}\to {}_{}{}^6{}_{}{}^{}P_{\frac{7}{2}}^{}{}_{}{}^{}$ transition confirms that the symmetry of the ${\mathrm{Eu}}^{2+}$ ion is lower than cubic because of the presence of a charge-compensating cation vacancy. ${}_{}{}^6{}_{}{}^{}D$ and ${}_{}{}^6{}_{}{}^{}I$ multiplets have also been measured and their centers of gravity are compared with those observed in Ca${\mathrm{F}}_2$:${\mathrm{Eu}}^{2+}$.

• Received 23 December 1985

DOI:https://doi.org/10.1103/PhysRevB.34.2936