Double scattering correction in the interpretation of Rayleigh scattering data near the critical point of a binary liquid
Abstract
Double scattering contributions to the intensity of Rayleighscattered light near the critical point of a binary liquid are calculated for 90 deg scattering. A family of sample geometrics is considered, namely cylinders with arbitrary length to radius ratio and cuboids with square crosssections and arbitrary length to side ratio. For binary liquids with nearly matched refractive indices, these terms can be sufficiently large that they affect the interpretation of data with respect to the value of the critical exponent eta and the deviation of the correlation function from OrnsteinZernike form, yet small enough that higher order contributions can be neglected. Numerical results are presented for all temperatures above T sub c together with analytical results in certain limiting cases. Near the critical point, the double scattered intensity is comparable with that lost through extinction and these two effects cancel in leading order. Some analytical results are also obtained for the depolarization ratio.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 May 1975
 Bibcode:
 1975STIN...7614455B
 Keywords:

 Binary Mixtures;
 Light Scattering;
 Rayleigh Scattering;
 Critical Temperature;
 Liquids;
 Mathematical Models;
 Numerical Analysis;
 Refractivity;
 Lasers and Masers