Title: The Mössbauer Effect and Its Application in Chemistry
Abstract: The Mössbauer effect involves the resonance fluorescence of nuclear gamma radiation and can be observed during recoilless emission and absorption of radiation in solids. It can be exploited as a spectroscopic method by observing chemically dependent hyperfine interactions. The recent determination of the nuclear radius term in the isomer shift equation for 119Sn shows that the isomer shift becomes more positive with increasing s electron density at the nucleus. Detailed studies of the temperature dependence of the recoil-free fraction in 119Sn and 129I labeled SnI4 show that the characteristic "Mössbauer temperatures," θM, are different for the two atoms. These results are typical of the kind of chemical information which can be obtained from Mössbauer spectra.