Critical scattering of laser light by fluid films and interfaces
Abstract
The first intensity autocorrelation studies on thin critical fluid films was carried out on trapped films of a 2,6 Lutidine + water critical mixture. The scaled Rayleigh linewidth was measured for a range of k xi spanning both the hydrodynamic (k xi 1) and nonhydrodynamic regimes. Film thicknesses were 13.1, 4.1 and 2.1 micrometers. These studies showed that the critical dynamics of fluid films is indistinguishable from that of large samples, even under conditions such that the correlation length is or = film thickness. A theory of the lattice dynamics of colloidal particle crystals was developed and verified by studies of the intensity and intensity autocorrelation of thermal diffuse scattered light measured about Bragg peaks.
- Publication:
-
Colorado University Report
- Pub Date:
- 1982
- Bibcode:
- 1982colo.reptQ....M
- Keywords:
-
- Dynamic Characteristics;
- Fluid Films;
- Laser Beams;
- Light Scattering;
- Thin Films;
- Autocorrelation;
- Bragg Angle;
- Colloids;
- Crystal Lattices;
- Diffuse Radiation;
- Film Thickness;
- Rayleigh Scattering;
- Optics