Light scattering

About: Light scattering is a research topic. Over the lifetime, 37721 publications have been published within this topic receiving 861581 citations.

Aging processes and scale dependence in soft glassy colloidal suspensions.

Abstract: The aging behavior of colloidal suspensions of laponite, a model synthetic clay, is investigated using light scattering techniques. In order to measure the complete dynamic structure factor as a function of time and of wave vector, we have developed an original optical setup using a multispeckle technique for simple light scattering. We have thus measured the correlation of the scattered light intensity as a function of the age of the sample t(w) for various concentrations. For sufficiently concentrated samples, we observe a two-stage relaxation process. The fast relaxation is diffusive, stationary, and reminiscent of the liquidlike behavior observed in less concentrated samples. The slow relaxation behavior, however, is more complex. It exhibits two successive regimes as the sample ages. In the first regime, the decay time tau(a) increases exponentially with t(w) as long as tau(a)

Concerning the Scattering of Fast Electrons and of Cosmic-Ray Particles

Abstract: When a particle, as the result of passing through a thickness of matter, is “scattered” through an angle, a, the scattering may be the result of the accumulated effect of a number of small deflexions produced by different atomic nuclei in the matter traversed, or it may be due to a single deflexion through an angle a produced by some one nucleus. The first type of scattering is spoken of as “multiple” or “plural”, according as the number of contributing collisions is large or small. The second type is referred to as “single” scattering. Which process is mainly operative depends on the nature and velocity of the scattered particle, the matter traversed, and the scattering angle. Under the conditions of single scattering the experimental results may be readily compared with the theory of the scattering by a single nucleus or atom, and they have in that way a direct fundamental significance. The theory of multiple and plural scattering, in addition to the deduction of the single scattering formula, involves a statistical problem. An accurate treatment of the latter is in general not possible, and to the extent that this is so the corresponding experimental results are lacking in fundamental interest.

Improved algorithm for electromagnetic scattering of plane waves and shaped beams by multilayered spheres

Abstract: An efficient numerical procedure for computing the scattering coefficients of a multilayered sphere is discussed. The stability of the numerical scheme allows us to extend the feasible range of computations, both in size parameter and in number of layers for a given size, by several orders of magnitude with respect to previously published algorithms. Exemplifying results, such as scattering diagrams and cross-sectional curves, including the case of Gaussian beam illumination, are provided. Particular attention is paid to scattering at the rainbow angle for which approaches based on geometrical optics might fail to provide accurate enough results.