In Chapter 1 it was shown that the Mössbauer spectrum is a record of the intensity of a transmitted γ-ray beam as a function of the Doppler velocity between the source and absorber. The resonant absorption line has a Lorentzian shape of width Γr and is centred at zero relative velocity between source and absorber. The practical application of this measurement would be limited were it not for the fact that the energies of the nuclear states are weakly influenced by the chemical environment. It is possible to detect these extremely small effects because of the high definition (better than 1 in 1012) of the γ-ray energy.
KeywordsMossbauer Spectroscopy Hyperfine Interaction Quadrupole Splitting Mossbauer Spectrum Electric Field Gradient Tensor
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