Abstract
We derive an expression for the Mössbauer line shape in the presence of an electric field gradient which jumps at random between the , , and axes. This Hamiltonian represents an idealized model for the effects on a nucleus of Jahn-Teller distortions, jump diffusion of vacancies, or electronic relaxation. A simplified calculation based on a model in which the field gradient jumps between positive and negative values along the axis is also given. In certain limiting circumstances the two calculations give similar results: The Mössbauer line shape consists of a single unsplit line for fast jumping, and of a quadrupole doublet for slow transitions. The results of the calculation agree with experiments of Pipkorn and Leider and of Chappert, Frankel, and Blum, as interpreted by Ham.
- Received 4 August 1967
DOI:https://doi.org/10.1103/PhysRev.165.456
©1968 American Physical Society