Abstract
The interpretation of second-order Raman spectra involves assignments of observed peaks to the frequencies of certain phonons. The peaks appear where the two-phonon density of states is high i.e. close to the zone boundaries and inside the zone in areas where the phonon dispersion curves exhibit maxima or minima. It is shown, with NaCl as an example, that a detailed knowledge of the dispersion curves is essential in making correct assignments.
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