Temperature Dependence of Critical Opalescence in Carbon Dioxide

14 June 1971

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 26 (24) , 1468-1471
https://doi.org/10.1103/physrevlett.26.1468

Abstract

Rayleigh scattering has been studied along the critical isochore and the coexistence curve of carbon dioxide. Measured intensities interpreted according to the theory of Ornstein and Zernike agree with expectation based on classical

PVT

measurements. It is suggested that over many decades of temperature distance from

T_{c}

the

PVT

and optical data are consistent with a reduced compressibility

{(\frac{\partial ρ}{\partial μ})}_{T} = Γ t^{- γ}

, and

Γ^{'} {(- t)}^{{- γ}^{'}}

, with

t = \frac{(T - T_{c})}{T_{c}}

, where

γ = 1.17 \pm 0.02 = γ^{'}

and

Γ = 0.072 \pm 0.006 = 4.1 Γ_{gas}^{'} ≃ 3.6 Γ_{liq}^{'}

Keywords

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