Quasi-electric light scattering

In this study, has been investigated by means of quasi-elastic light scattering and transient electric birefringence the effect of the quenching concentration on the structure of the PVC aggregates as well as the thermal stability of these aggregates. 

In dynamic or quasi-elastic light scattering, a time dependent correlation function (i (0) i (t)) = G2 (t) is measured, where i (0) is the scattering intensity at the beginning of the experiment, and i (t) that at a certain time later. Under the conditions of dilute solution (independent fluctuation of different small volume elements), the intensity correlation function can be expressed in terms of the electric field correlation function gi (t)... 

Quasi-elastic Light Scattering Conversion3 Transient Electric Birefringence Viscosity Corrected to w, 20°C Sense of Biref. 

Structural properties can be investigated by small-angle neutron scattering (SANS) [3-5] or by quasi-elastic light scattering (QELS) [6-8]. Interphasal properties can be studied by dielectric spectroscopy and electrical conductivity mea-... 

The semiclassical description of light scattering attributes the effect to a light-induced (electric) dipole moment in the molecule that oscillates with the frequency of the incident radiation co and becomes the source of quasi-immediate re-emission at the same frequency. Mathematically, this is expressed as... 

K. S. Schmitz. Quasi-elastic light scattering studies on T7 DNA in the presence of a sinusoidal electric field. Chem. Phys., 79 (1982), 297-305. 

K. Ito and R. Hayakawa. Quasi-elastic light scattering with the sinusoidal electric field New measurement methods and frequency dispersion of the electrophoretic mobility and diffusion constant of polyions. Colloids and Surfaces A, 148 (1999), 135-148. 

Another particle-sizing method, called photon correlation spectroscopy (PCS), dynamic light scattering (DLS) or quasi-electric light scattering (QELS), relies on both the light scattering and the Brownian motion of the particles. An ensemble of... 

Experimentally, the diffusion coefficient is measmed by quasi-eleastic light scattering experiments (QELS). We recall the principle of the experiment. In semi-dilute solutions or gels, the polarized quasi-elastic light scattering is due to the local concentration fluctuations of the polymer. At a scattering angle 6, the autocorrelation function of the scattered electric field is >... 

The electrical resistivity is determined by the inverse lifetime of the quasi-particles averaged over the Fermi distribution. The calculated p(T) curve, shown in fig. 43, starts from zero at T = 0, rises exponentially until a peak is reached around T = ri/k, and drops smoothly to zero at higher temperatures. Again, variations of /i(0) produces only slightly different results. The low-temperature part is in disagreement with experiments, because the calculation fails to include the mutual scattering effect of quasi-particles. The resistivity peak reflects the breakdown of the band structure, which takes place when the temperature reaches rj/kg. The model does not shed light on the variety of resistivity behaviors shown in fig. 6. 

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