Effects of polydispersity, branching and chain stiffness on quasielastic light scattering

Effects of Polydispersity, Branching and Chain Stiffness on Quasielastic Light Scattering

Aspects of polarized coherent quasi-elastic scattering by dilute macromolecular solutions are discussed. Effects of polydispersity, branching and chain stiffness are considered, particularly in respect to the observable first cumulant of the dynamic structure factor and its dependence on the scattering angle. A combination of integrated and time-resolved scattering data yields the maximum infor...

Quasielastic light scattering from rutile

Quasielastic light scattering in silicon

A dominant, broad central mode in the Brillouin spectrum of silicon was first reported by Sandercock in 1978. This feature was later ascribed to a two-phonon difference scattering process. However, the issue of quasielastic scattering in silicon has remained a major outstanding problem in Brillouin scattering, because similar central modes in other materials have commonly displayed two componen...

Quasielastic light scattering for protein assembly studies.

Quasielastic light scattering (QLS) spectroscopy is an optical method for the determination of diffusion coefficients of particles in solution. In this chapter, we discuss the principles and practice of QLS with respect to protein assembly reactions. Particles undergoing Brownian motion produce fluctuations in scattered light intensity. We describe how the temporal correlation function of these...

Suppression of multiple scattering effects in quasielastic light scattering by homodyne cross-correlation techniques

By studying cross correlations in the intensity of light scattered by a fluid sample in different directions at different times, it is possible to measure the dynamic scattering function S(k,t) for the fluid. The multiple scattering contribution to the time-dependent cross correlations is very substantially less than the multiple scattering contribution to S(k,t) as obtained by a conventional s...