Brillouin Spectra of Ethyl Ether and Carbon Disulfide
作者:
S. Gewurtz,
W. S. Gornall,
B. P. Stoicheff,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1971)
卷期:
Volume 49,
issue 3C
页码: 994-1000
ISSN:0001-4966
年代: 1971
DOI:10.1121/1.1912460
出版商: Acoustical Society of America
数据来源: AIP
摘要:
Brillouin spectra of ethyl ether and carbon disulfide (at 20.0°C) were investigated for scattering angles of 20°–145°. A single‐mode laser was used for excitation; scattered light was collected in a solid angle of 1.5×10−4sr; and the total instrumental width was ∼100 Mc/sec. Linewidths of 10±5 to 215±10 Mc/sec were measured and velocities determined to an accuracy of ±0.5%. In ethyl ether the phonon velocity and attenuation were constant in the frequency range 0.8–4.1 Gc/sec, and the values agreed with acoustic measurements at 100 Mc/sec. InCS2a considerable decrease in attenuation was observed in the range 1.7–6.1 Gc/sec, with the value at high frequency approaching the classical attenuation attributed to shear viscosity. This variation in attenuation is in good agreement with the theory of a single relaxation time for the total vibrational specific heat, as established by acoustic measurements in the frequency range 2–200 Mc/sec.
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