Nonadiabatic approach to tunneling centers and their isotope effect
- 15 January 1981
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 23 (2), 685-694
- https://doi.org/10.1103/physrevb.23.685
Abstract
In previous theoretical work on paraelectric centers (e.g., KCl: O) the inertia of the tunneling particle (e.g., ) has been neglected (adiabatic approximation). In the present work a nonadiabatic treatment of the phonon-assisted tunneling is given. A considerable alteration in the transition rates is found. Further on, the isotope effect is shown to exhibit "dynamical" features in addition to the "static" ones treated so far. A 90° transition for KCl: O is calculated. Idealized lattice dynamics is used in the form of the Debye model.
Keywords
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