Abstract
AbstractAn apparatus for resonant optoacoustic spectroscopy is described. The dispersion of the acoustic resonance frequency and the variation of the frequency bandwidth was studied as a function of pressure in the vibrational relaxation region for pure CH4 and mixtures with Xe and H2. These measurements yield the corresponding relaxation times and a better understanding of the dissipation effects caused by energy transfer processes. The role played by other loss mechanisms is also discussed.
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