Lorentzian model mixtures

Fig. 7. Extracted pure component spectra from Lorentzian model mixtures...

In an attempt to model the spectral functions of rare gas mixtures, Fig. 3.2, it was noted that a Gaussian function with exponential tails approximates the measurements reasonably well [75], about as well as the Lorentzian core with exponential tails. Two free parameters were chosen such that at the mending point a continuous function and a continuous derivative resulted the negative frequency wing was again chosen as that same curve, multiplied by the Boltzmann factor, to satisfy Eq. 3.18. Subsequent work retained the combination of a Lorentzian with an exponential wing and made use of a desymmetrization function [320],... 

Mossbauer Spectroscopy. The Pt Mossbauer spectra for various tetracyanoplatinates at 4.2 K have been reported, Table VIII. The spectra observed were singlets and had a Lorentzian lineshape. The data confirm that the partially oxidized species cannot be considered as a mixture of isolated Pffi and Pffv atoms even on the Mossbauer time scale (lO sec). The results are consistent with the model of an insulator at low temperatures with the electrons essentially delocalized along the Pt chains (360). 

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