Abstract
The spectral line shape of spontaneous Rayleigh–Brillouin scattering in is studied in a range of pressures. The spectrum is influenced by the bulk viscosity , which is a relaxation phenomenon involving the internal degrees of freedom of the molecule. The associated relaxation rates can be compared to the frequency shift of the scattered light, which demands precise measurements of the spectral line shape. We find for the range of pressures bar and for room temperature conditions.
© 2014 Optical Society of America
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