Coherent and spontaneous Rayleigh-Brillouin scattering in atomic and molecular gases and gas mixtures

M.O. Vieitez, E.-J. Duijn, van, W. Ubachs, B. Witschas, A. Meijer, A.S. Wijn, de, N.J. Dam, W. Water, van de

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Abstract

We study Rayleigh-Brillouin scattering in gases of N2, O2, and SF6 molecules, Kr atoms, and He-Xe and He-CO2 mixtures at pressures ranging from 1 to 3 bar and using two different experimental setups. In one setup, we measure spectra of light scattered by thermal density fluctuations (spontaneous Rayleigh-Brillouin scattering); in the second setup density waves are induced in the overlap region of two counterpropagating laser beams (coherent Rayleigh-Brillouin scattering). We compare measured spectra to the Tenti models and to a recent model for mixtures. We find new values of the bulk viscosity, which is a parameter in line-shape models that allows for internal degrees of freedom. Both experiments agree on the value of the bulk viscosity. Our results indicate a need for new line-shape models for mixtures of molecules with internal degrees of freedom.
Original languageEnglish
Article number043836
Pages (from-to)043836-1/14
Number of pages14
JournalPhysical Review A : Atomic, Molecular and Optical Physics
Volume82
Issue number4
DOIs
Publication statusPublished - 2010

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