Intensity, correlation, and statistics of Rayleigh-scattered light near the gas-liquid critical point of 3He

Autor: Akira Ikushima, Kohji Ohbayashi
Rok vydání: 1975
Předmět:
Zdroj: Journal of Low Temperature Physics. 19:449-465
ISSN: 1573-7357
0022-2291
DOI: 10.1007/bf00114092
Popis: The intensity, correlation, and statistics of Rayleigh-scattered light were measured near the gas-liquid critical point of 3He along the coexistence curve and the critical isochore in the temperature region 10−5 < ¦ɛ¦ < 4 × 10−2 (ɛ ≡ ¦T − T c¦/T c). From the intensity measurements, the following critical parameters have been obtained: γ = 1.14 ± 0.05, Ν = 0.59 ± 0.04, and ξ0 = 4.8 ± 2A for T > T c (along the critical isochore); γ′ = 1.16 ± 0.07, Ν′ = 0.68 ± 0.07, and ξ+ = 4.3 ± 3.2 A for T < T c (liquid phase along the coexistence curve); and χ0/χ+ = 3.6 ± 0.4. From the correlation measurements, the total thermal diffusivity along the critical isochore in the hydrodynamic region has been determined to be D T = (1.57 ± 0.10) × 10−4ɛ0.68 ± 0.03 cm2/sec. The temperature and wave-vector dependence of the singular part of the Rayleigh linewidth has been shown to fit Kawasaki's modified expression with the parameters ξ0 = 3.3ɛ−0.59 A and η = 13(1.15 + 3.19 × 10−2 ln ɛ)−1 ΜP. The statistics of the critical fluctuation have been found to be Gaussian.
Databáze: OpenAIRE
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