A paraelectric resonance study has been made of KCl:${}_{}{}^7{}_{}{}^{}\mathrm{Li}_{}^{+}{}_{}{}^{}$ over the frequency range 20-150 GHz. The data have been fitted to a $〈111〉$-dipole model. The best-fit tunneling parameters (including the estimated systematic errors) are $\eta =-11.34\mathrm{}\pm 0.4$, $\mu =-3.55\mathrm{}\pm 0.4$, and $\nu =0.21\mathrm{}\pm 0.4$. The electric dipole moment is 5.683±0.06 D. These parameters are compared critically with the existing data on KCl:${}_{}{}^7{}_{}{}^{}\mathrm{Li}_{}^{+}{}_{}{}^{}$.

• Received 24 September 1982

DOI:https://doi.org/10.1103/PhysRevB.27.5286