Lamb-Mdssbauer factor

The relatively low Lamb-Mossbauer factors encountered in Ni Mdssbauer spectroscopy (a diagram showing the Lamb-Mdssbauer factor as a function of Debye temperature is given in [3]) require the cooling of both source and absorber, preferentially to temperatures S80 K. The cryogenic systems have been described, e.g., in [2, 4]. 

There have been several reports (Boolchand et al., 1999) on glassforming liquids to show that a transition from floppy to rigid states as a function of composition is associated with discontinuities in one or the other properties of the system. These experiments include inelastic neutron scattering to characterize the floppy modes, Lamb-Mdssbauer factors. 

The Mdssbauer—Lamb factors fs (for the source) and /a (for the absorber) show up as coefficients to determine the Mdssbauer peak intensity (seeO Eq. (25.31) for the transmission integral). Unfortunately, it is difficult to determine the absolute values of fs and from the absorption intensity without tedious and difficult experimentation. 

When the Mdssbauer nuclides are in different microenvironments, the determination of the relative values of the Mdssbauer—Lamb factors belonging to each microenvironment is necessary in order to obtain the correct relative molar quantities. 

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