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

Vieitez, Maria Ofelia and van Duijn, Eric-Jan and Ubachs, Wim and Witschas, Benjamin and Meijer, Afric and de Wijn, Astrid and Dam, Nico and van de Water, Willem (2010) Coherent and spontaneous Rayleigh-Brillouin scattering in atomic and molecular gases and gas mixtures. Physical Review A, 82 (043836), pp. 1-14. DOI: 10.1103/PhysRevA.82.043836.

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Official URL: http://pra.aps.org/pdf/PRA/v82/i4/e043836

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.

Document Type:Article
Title:Coherent and spontaneous Rayleigh-Brillouin scattering in atomic and molecular gases and gas mixtures
Authors:
AuthorsInstitution or Email of Authors
Vieitez, Maria OfeliaVrije Univ., Amsterdam, NL
van Duijn, Eric-JanVrije Univ., Amsterdam, NL
Ubachs, WimVrije Univ., Amsterdam, NL
Witschas, BenjaminBenjamin.Witschas@dlr.de
Meijer, AfricRadboud Univ., Nijmegen, NL
de Wijn, AstridRadboud Univ., Nijmegen, NL
Dam, NicoRadboud Univ., Nijmegen, NL
van de Water, WillemW.v.d.Water@tue.nl
Date:25 October 2010
Journal or Publication Title:Physical Review A
Refereed publication:Yes
In SCOPUS:No
In ISI Web of Science:Yes
Volume:82
DOI:10.1103/PhysRevA.82.043836
Page Range:pp. 1-14
Status:Published
Keywords:Rayleigh-Brillouin scattering, spectroscopy, Lidar, gas mixtures, bulk viscosity.
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben ADM (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Dr. Benjamin Witschas
Deposited On:29 Oct 2010 12:56
Last Modified:12 Dec 2013 21:03

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