1,721,021 research outputs found
Fabry-Perot spectra of depolarized Rayleigh wing in water: a new analysis of its temperature dependence
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Sound dispersion and attenuation in concentrated H2SO4 by visible and ultraviolet Brillouin spectroscopy
No full text"The acoustic properties of highly concentrated H2SO4 are investigated performing visible and ultraviolet. Brillouin scattering measurements. We analyzed the isotropic and anisotropic spectra of this. molecular liquid in a wide temperature and exchanged wavector range in order to study the evolution. of its sound velocity and viscosity. This allows us to extract the parameters required to describe. its viscoelastic relaxation behavior. We found that the behavior of the hydrodynamic parameters of. this molecular liquid shares some similarities with that of water indicating a rather high increase of. sound velocity if compared to that measured by ultrasonics. © 2011 American Institute of Physics.
Brillouin and Raman Scattering from Liquid water
No full textRecent experimental results obtained on normal and deuterated water using light-scattering spectroscopy from Brillouin to librational Raman frequencies are reviewed.
Particular attention is devoted to the librational mode region and to the Rayleigh wing where both new measurements (including depolarization ratio measurements and absolute intensities analysis) and computer simulation have pointed out the importance of “interaction-induced” scattering contributions in interpreting quantitatively this low-frequency part of the spectrum. The agreement between experimental and simulated data extends up to the 400 wavenumbers band, excluding the presence of direct electronic disturbances created by hydrogen-bond formation dynamics in this spectral region
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