Abstract
We have studied both the librational and the tunneling excitations of ions in a KBr matrix through the interaction of these modes with the acoustic phonons of the KBr host. From our measurements on a sample containing 0.00034 mole fraction of KCN in KBr, we find the tunnel splitting to be 0.28 ± 0.05 meV (2.3 ± 0.4 ). From measurements on a more concentrated system, 0.0045 mole fraction of KCN in KBr, the librational excitation energy is found to be 1.6 ± 0.1 meV (13.0 ± 1.0 ). These values are consistent with the results of optical measurements.
- Received 8 January 1980
DOI:https://doi.org/10.1103/PhysRevB.21.4863
©1980 American Physical Society