Abstract
The $^{57}\mathrm{Fe}$ M\ossbauer emission spectra of $^{57}\mathrm{Co}$ implanted in the rare-gas matrices Ne, Ar, Kr, Xe, and the rare-gas mixture Ar+10 at. % Xe show systematic behavior in the ionization states of $^{57}\mathrm{Fe}$ following the electron-capture decay of $^{57}\mathrm{Co}$. This systematic behavior can be explained by a charge transfer process via resonant tunneling between the Fe ion and one of its rare-gas nearest neighbors. The recombination with ``free'' electrons is found to be important in the Xe matrix only. A new \ensuremath{\Delta}〈${r}^{2}$〉 value is given for the M\ossbauer transition in $^{57}\mathrm{Fe}$.
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