Rayleigh–Brillouin Scattering in Compressed H2, D2, and HD. II

1972 ◽  
Vol 50 (12) ◽  
pp. 1227-1229 ◽  
Author(s):  
E. H. Hara ◽  
A. D. May
Keyword(s):  
Thermal Conduction ◽  
Brillouin Scattering ◽  
Hydrodynamic Theory ◽  
Brillouin Spectrum

The observations presented by Hara et al. for the Brillouin spectrum of H2, D2, and HD are compared with the thermo-hydrodynamic theory of Bhatia and Tong. It is noted that although this theory is qualitatively correct it fails to describe accurately the spectrum at low to medium densities. It is suggested that the introduction of a relaxing thermal conduction might account for the discrepancy observed.

Rayleigh–Brillouin Scattering in Compressed H2, D2, and HD

1971 ◽  
Vol 49 (4) ◽  
pp. 420-431 ◽  
Author(s):  
E. H. Hara ◽  
A. D. May ◽  
H. F. P. Knaap
Keyword(s):  
High Pressure ◽  
Thermal Conduction ◽  
Room Temperature ◽  
Brillouin Scattering ◽  
Photon Counting ◽  
High Pressure Cell ◽  
Rotational States ◽  
Pressure Cell ◽  
Fabry Perot ◽  
Brillouin Spectrum

The Rayleigh–Brillouin spectrum of light scattered from H2, D2, and HD has been measured at densities ranging from 1/2 to 104 amagat, all at room temperature. The apparatus consisted of a 20 mW He–Ne laser, a high pressure cell for 90° scattering, a pressure scanned Fabry–Perot interferometer, and photon counting electronics. A discrepancy is noted between the observed spectra and various theoretical spectra. It is suggested that the discrepancy arises from an omission in the theories of coupling between relaxation of the rotational states and thermal conduction.

The Rayleigh–Brillouin spectrum of compressed H2; a test of translational hydrodynamics

1977 ◽  
Vol 55 (1) ◽  
pp. 23-26 ◽  
Author(s):  
M. Hubert ◽  
A. D. May
Keyword(s):  
Reasonable Agreement ◽  
Hydrodynamic Theory ◽  
Rotational States ◽  
Energy And Momentum ◽  
Brillouin Spectrum

This paper reports on a comparison between the observed Rayleigh–Brillouin spectra of compressed hydrogen and those computed according to the translational hydrodynamic theory of Desai and Kapral. Reasonable agreement is found in the range of densities from 19 to 61 amagat units. It is suggested that small residual discrepancies may be due to the neglect of part of the coupling between the energy and momentum fluctuations arising from relaxation of the rotational states, i.e. due to the neglect of the 1ν1 terms.

The Rayleigh–Brillouin spectrum of hydrogen at high densities

1978 ◽  
Vol 56 (9) ◽  
pp. 1168-1174 ◽  
Author(s):  
A. D. May ◽  
M. Hubert ◽  
V. Ghaem-Maghami
Keyword(s):  
Relaxation Time ◽  
Theoretical Calculations ◽  
Hydrodynamic Theory ◽  
Normal Hydrogen ◽  
Brillouin Spectrum

The Rayleigh–Brillouin spectrum of light scattered from hydrogen at high densities is reported. The observations are compared with translational hydrodynamic theory and ultrasonic experiments. The range of densities includes the relaxation region and we find evidence for multiple relaxation. A mean relaxation time for normal hydrogen at 24 °C of (1.41 ± 0.06) × 10−8 s is found, in agreement with theoretical calculations.

Brillouin scattering from cross-linked gels

1992 ◽  
Vol 2 (12) ◽  
pp. 2081-2088 ◽  
Author(s):  
Francesco Mallamace ◽  
Norberto Micali ◽  
Cirino Vasi ◽  
Rama Bansil ◽  
Sinisa Pajevic ◽  
...  
Keyword(s):  
Brillouin Scattering

THEORY OF ACOUSTIC PHONONS AT INTERFACES AND BRILLOUIN SCATTERING

1981 ◽  
Vol 42 (C6) ◽  
pp. C6-804-C6-806
Author(s):  
V. Bortolani ◽  
F. Nizzoli ◽  
G. Santoro ◽  
A. Marvin
Keyword(s):  
Brillouin Scattering ◽  
Acoustic Phonons

THEORY OF BRILLOUIN SCATTERING BY AN ISOTROPIC ELASTIC PLATE

1984 ◽  
Vol 45 (C5) ◽  
pp. C5-103-C5-107
Author(s):  
D. R. Tilley ◽  
E. L. Albuquerque ◽  
M. C. Oliveros
Keyword(s):  
Elastic Plate ◽  
Brillouin Scattering
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