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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. American Physical Society. 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.

Item URL in elib:https://elib.dlr.de/65908/
Document Type:Article
Title:Coherent and spontaneous Rayleigh-Brillouin scattering in atomic and molecular gases and gas mixtures
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Vieitez, Maria OfeliaVrije Univ., Amsterdam, NLUNSPECIFIED
van Duijn, Eric-JanVrije Univ., Amsterdam, NLUNSPECIFIED
Ubachs, WimVrije Univ., Amsterdam, NLUNSPECIFIED
Witschas, BenjaminBenjamin.Witschas (at) dlr.deUNSPECIFIED
Meijer, AfricRadboud Univ., Nijmegen, NLUNSPECIFIED
de Wijn, AstridRadboud Univ., Nijmegen, NLUNSPECIFIED
Dam, NicoRadboud Univ., Nijmegen, NLUNSPECIFIED
van de Water, WillemW.v.d.Water (at) tue.nlUNSPECIFIED
Date:25 October 2010
Journal or Publication Title:Physical Review A
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:82
DOI :10.1103/PhysRevA.82.043836
Page Range:pp. 1-14
Publisher:American Physical Society
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: Witschas, Dr. Benjamin
Deposited On:29 Oct 2010 12:56
Last Modified:21 Aug 2020 04:22

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