Mössbauer relaxation line shapes in the presence of complex hyperfine interactions

We have utilized a result of Clauser to evaluate the line shape of Mössbauer resonance spectra involving spin relaxation effects even in cases with nondiagonal hyperfine interactions. Compared to traditional methods for calculating the line shapes, this formulation saves computational time by approximately two orders of magnitude and thus makes possible consideration of many problems which were previously intractable. Examples are given for cases involving complicated hyperfine Hamiltonians, viz., hemoglobin cyanide, acid met myoglobin, and Np${\mathrm{F}}_6$.