Rayleigh-Brillouin scattering in binary-gas mixtures

Z. Gu, W. Ubachs, W. Marques, W. van de Water

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Abstract

Precise measurements are performed on spectral line shapes of spontaneous Rayleigh-Brillouin scattering in mixtures of the noble gases Ar and Kr, with He. Admixture of a light He atomic fraction results in marked changes of the spectra, although in all experiments He is merely a spectator atom: it affects the relaxation of density fluctuations of the heavy constituent, but its contribution to the scattered light intensity is negligibly small. The results are compared to a theory for the spectral line shape without adjustable parameters, yielding excellent agreement for the case of binary monatomic gases, signifying a step towards modeling and understanding of light scattering in more complex molecular media.

Original languageEnglish
Article number243902
Pages (from-to)1-5
JournalPhysical Review Letters
Volume114
Issue number24
DOIs
Publication statusPublished - 17 Jun 2015

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