Isotope Shift of a Low-Lying Lattice Resonant Mode
- 1 November 1965
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 140 (3A) , A1030-A1032
- https://doi.org/10.1103/physrev.140.a1030
Abstract
A sharp and very low-frequency lattice absorption due to a lithium resonant mode has been found in KBr:LiBr. A large frequency shift with lithium isotopes has been observed. The experimental results can be understood with a simplified lattice model in which both nearest-neighbor force constants and the mass of the impurity are varied. It is concluded that the resonant mode comes from a remarkable softening of the forces between the impurity and the surrounding lattice.Keywords
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