Abstract
The influence of hydrogen diffusion on the Mössbauer spectra of 57Fe in palladium, niobium and vanadium was studied. It causes a time dependence of the hyperfine interactions and positions of the probe atoms. The latter effect in particular gives rise to an anomalous temperature dependence of the apparent spectral intensity or effective Mössbauer-Lamb factor. This is due to the occurrence of a broadened quasi-elastic component in the spectra. When suitable models are used, these phenomena permit the magnitude of the hydrogen-induced displacements of the Mössbauer atoms and the temperature dependence of the jump rates of hydrogen in the neighbourhood of the probes to be determined.
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