Rayleigh-Brillouin Scattering in Binary-Gas Mixtures

Z. Gu, W.M.G. Ubachs, W. Marques, W. van der Water

Research output: Contribution to JournalArticleAcademicpeer-review


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)243902
JournalPhysical Review Letters
Issue number24
Publication statusPublished - 2015


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