Critical Opalescence: The Rayleigh Linewidth
1966; American Institute of Physics; Volume: 45; Issue: 12 Linguagem: Inglês
10.1063/1.1727523
ISSN1520-9032
AutoresH. Z. Cummins, Harry L. Swinney,
Tópico(s)Atmospheric Ozone and Climate
ResumoDebye's derivation of the Ornstein—Zernike modification of Einstein's theory of critical opalescence is reviewed. It is shown that Debye's free-energy function leads to a modification of the Landau theory for the width of the Rayleigh line which is equivalent to the results of Fixman, Botch, and Felderhof. This equivalence is utilized to predict the magnitude of the departure of Rayleigh linewidths from the Landau prediction by comparison with the results of angular-scattering intensity measurements. It is thus shown that in light-scattering experiments, pure fluids should obey the Landau theory quite accurately, whereas critical mixtures should show significant departures from the Landau prediction.
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