Fine structure of critical opalescence spectra

• Published in: Физика низких температур
• Date: 2007
• Main Author: Sushko, M.Ya.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2007
• Subjects: International Conference "Statistical Physics 2006. Condensed Matter: Theory and Application"
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/120940
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Fine structure of critical opalescence spectra / M.Ya. Sushko // Физика низких температур. — 2007. — Т. 33, № 09. — С. 1055–1058. — Бібліогр.: 16 назв. — англ.

The effect of the 1.5-scattering mechanism on the time and temperature behavior of the electric field
 autocorrelation function for the light wave scattered from fluids has been studied for the case where the order-
 parameter fluctuations obey the diffusion-like kinetics with spatially-dependent kinetic coefficient. The
 leading contributions to the relevant static correlation functions of the order-parameter fluctuations were
 obtained by using the Ginzburg–Landau model with a cubic term, and then evaluated with the use of the
 Gaussian uncoupling for many-point correlation functions and the Ornstein–Zernicke form for the pair correlation
 function. It is shown that the presence of the 1.5-scattering effects in the overall scattering pattern
 may be detected in the form of a small but noticeable deviation from exponential decay of the total electric
 field autocorrelation function registered experimentally near the critical point. Obtained with the standard
 methods of analysis, the effective halfwidth of the corresponding spectrum can reveal a stronger temperature
 dependence and a multiplicative renormalization as compared to the halfwidth of the spectrum of the
 pair correlator.