title: Rayleigh-Brillouin Scattering in Binary-Gas Mixtures.
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.
authors.affiliation: Department of Physics and Astronomy, and LaserLab, VU University, De Boelelaan 1081, 1081 HV Amsterdam, Netherlands.
authors.forename: Z
authors.initials: Z
authors.lastname: Gu
authors.affiliation: Department of Physics and Astronomy, and LaserLab, VU University, De Boelelaan 1081, 1081 HV Amsterdam, Netherlands.
authors.forename: W
authors.initials: W
authors.lastname: Ubachs
authors.affiliation: Departamento de Física, Universidade Federal do Paraná, Caixa Postal 10944, 81531-990, Curitiba, Brazil.
authors.forename: W
authors.initials: W
authors.lastname: Marques
authors.affiliation: Physics Department, Eindhoven University of Technology, Postbus 513, 5600 MB Eindhoven, Netherlands.
authors.forename: W
authors.initials: W
authors.lastname: van de Water