Studying the structure of a dispersive medium using multiple light scattering data (for an arbitrary incident light direction)

1966 ◽  
Vol 4 (2) ◽  
pp. 121-126
Author(s):  
A. V. Chalyi
Keyword(s):  
Light Scattering ◽  
Dispersive Medium ◽  
Incident Light ◽  
Scattering Data ◽  
Multiple Light Scattering

Mathematical inversion of angular multiple light scattering data

1979 ◽  
Vol 18 (14) ◽  
pp. 2466 ◽  
Author(s):  
A. Cohen ◽  
J. Cooney ◽  
G. Raviv ◽  
N. Wolfson
Keyword(s):  
Light Scattering ◽  
Scattering Data ◽  
Multiple Light Scattering

Effect of multiple light scattering on dynamic characteristics of light scattered from latex particles

1990 ◽  
Vol 55 (4) ◽  
pp. 1022-1032 ◽  
Author(s):  
Čestmír Koňák ◽  
Jaromír Jakeš ◽  
František Petráš ◽  
Marie Kárská ◽  
Jan Peřina
Keyword(s):  
Correlation Function ◽  
Light Scattering ◽  
Scattered Light ◽  
Coherence Time ◽  
Scattering Data ◽  
Small Contribution ◽  
Auto Correlation ◽  
Auto Correlation Function ◽  
Time Changes ◽  
Multiple Light Scattering

The effect of multiple light scattering on a homodyne intensity auto-correlation function and photocount distribution of scattered light has been studied. The analysis of quasielastic light scattering data has shown that even a small contribution (several percent) of multiple light scattering to the total scattered light intensity can be distinguished and identified by the Laplace transform inversion of the corresponding intensity auto-correlation function. The photocount distribution reflects the coherence time changes of the scattered light only.

Collision-induced and multiple light scattering by simple fluids

1979 ◽  
Vol 293 (1402) ◽  
pp. 359-375 ◽  
Keyword(s):  
Light Scattering ◽  
Incident Light ◽  
Pair Correlation ◽  
Point Dipole ◽  
Scattered Intensity ◽  
Pair Correlations ◽  
Atomic Fluids ◽  
The Many ◽  
Correlation Properties ◽  
Multiple Light Scattering

Most discussions of light scattering by simple (e.g. classical, atomic) fluids have treated only ‘first order’ processes, i.e. those where the incident light is scattered only once and the atomic polarizabilities are undistorted by interaction. Correspondingly the scattered intensity is related by Fourier transform to the time- and space- pair correlations. In this paper we describe instead the ‘second order’ processes of collision-induced scattering (c.i.s.), in which the incident light is scattered only once but the relevant polarizability is that of an interacting cluster of atoms, and multiple light scattering (m.l.s.), in which only undistorted polarizabilities are involved but the incident light is scattered more than once. In both cases the scattered intensity is determined by correlations involving more than two particles. In addition, the c.i.s. experiments provide information about the many-atom polarization while the m.l.s. studies offer new probes of large fluctuations in critical and nucleating fluids. We discuss in particular theoretical and experimental c.i.s. investigations of the two-body polarizability anisotropy induced by collision; it is concluded that the nature and origin of non-point-dipole behaviour has yet to be satisfactorily explained. Similarly, we consider how various depolarization m.l.s. studies suggest improved analyses of pair correlation properties in classical systems.

Stress Whitening in Polypropylene. I. Light Scattering Theory and Model Experiments

1995 ◽  
Vol 60 (11) ◽  
pp. 1875-1887 ◽  
Author(s):  
Jaroslav Holoubek ◽  
Miroslav Raab
Keyword(s):  
Refractive Index ◽  
Light Scattering ◽  
Incident Light ◽  
Polymeric Materials ◽  
Wavelength Dependence ◽  
Theoretical Background ◽  
Surrounding Matrix ◽  
Embedded Particles ◽  
The One ◽  
Stress Whitening

Theoretical background for an optical method is presented which makes it possible to distinguish unambiguously between voids and particles as light scattering sites in polymeric materials. Typical dependences of turbidity as a function of diameter of scattering elements, their volume fractions and also turbidity curves as a function of the wavelength of the incident light were calculated, based both on the Lorenz-Mie theory and the fluctuation theory. Such dependences calculated for polypropylene-containing voids on the one hand and particles, differing only slightly from the surrounding matrix in their refractive index, on the other hand, are markedly different. The most significant results are: (i) Turbidity is at least by two orders of magnitude larger for voids in comparison to embedded particles of ethylene-propylene (EPDM) rubber of the same size, concentration and at the same wavelength. (ii) The wavelength dependence of turbidity for EPDM particles and the inherent refractive index fluctuations in the polypropylene matrix is much steeper as compared to voids for all considered diameters (0.1-10 μm). Thus, the nature of stress whitening in complex polymeric materials can be determined from turbidity measurements.

Universality of fractal aggregates as probed by light scattering

1989 ◽  
Vol 423 (1864) ◽  
pp. 71-87 ◽  
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Master Curve ◽  
Rotational Diffusion ◽  
Fractal Dimensions ◽  
Scattering Data ◽  
Diffusion Limited ◽  
Single Master Curve ◽  
Using Data ◽  
Dynamic Light Scattering Data

Fractal colloid aggregates are studied with both static and dynamic light scattering. The dynamic light scattering data are scaled onto a single master curve, whose shape is sensitive to the structure of the aggregates and their mass distribution. By using the structure factor determined from computer-simulated aggregates, and including the effects of rotational diffusion, we predict the shape of the master curve for different cluster distributions. Excellent agreement is found between our predictions and the data for the two limiting régimes, diffusion-limited and reaction-limited colloid aggregation. Furthermore, using data from several completely different colloids, we find that the shapes of the master curves are identical for each régime. In addition, the cluster fractal dimensions and the aggregation kinetics are identical in each régime. This provides convincing experimental evidence of the universality of these two régimes of colloid aggregation.

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