Abstract
Time-resolved CARS measurements of the internal vibrations in NaNO 3 crystals show an anomalous temperature dependence for the relaxation rate of the ν 1 symmetric stretching mode, whose linewidth decreases with increasing temperature. This unexpected result is attributed to the peculiar distribution of the two-phonon density of states; it proved direct evidence of the role of energy decay mechanisms in the relaxation of vibrational energy at relatively high temperatures.
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