Abstract
Abstract Mossbauer studies of ferrocene [ η 5 (C 5 H 5 ) 2 Fe] have been carried out over the temperature range 90 to 370 K. The spectra display unequal intensity quadrupole doublets, with the asymmetry showing a pronounced temperature dependence. Least squares fits of the experimental spectra, using a transmission integral program yield, besides the conventional hyperfine interaction parameters, the average recoil-free fraction and the intensity ratio of the quadrupole doublet components. These in turn yield the temperature dependence of the mean-square displacement amplitudes parallel and perpendicular to the iron atom local electric field gradient symmetry axis. At room temperature, [〈 x 2 para 〉] 1/2 =0.226±0.008 A while [〈 x 2 perp 〉] 1/2 =0.179±0.010 A. These results are in good agreement with data extracted from X-ray diffraction studies at the same temperature.
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