Abstract
Experimental demonstration of multiphonon-assisted anti-Stokes and Stokes excitation of rare-earth ions () in different hosts, that is, in a weak-coupling ion-lattice interaction case, is obtained. An exponential behavior of excitation probabilities with respect to energy difference between excitation and electronic line is found, just as for multiphonon-assisted nonradiative decay and energy transfer. Exponential parameters and for anti-Stokes and Stokes excitation are measured and linked to the Miyakawa-Dexter parameter for decay, leading to estimates for Pekar-Huang-Rhys coupling parameter of about 0.04, in agreement with values obtained from one-phonon spectra or nonradiative-decay measurements. A semiempirical formula is deduced to obtain from only one parameter, an effective phonon energy.
- Received 23 September 1975
DOI:https://doi.org/10.1103/PhysRevB.13.2809
©1976 American Physical Society