Depolarized light

Light-scattering measurements made over two suitably chosen angle intervals can combine with depolarized light-scattering measurements to... 

Finally, recently depolarized light scattering spectra [191] display an additional process that shows a much faster characteristic time and a much weaker temperature dependence than the dielectric j0-relaxation (more than three orders of magnitude faster time at -200 K and an activation energy of 0.16 eV, about half of the dielectric value). Also atomistic simulations on PB have indicated hopping processes of the frans-double bond [192,193] with an associated activation energy of -0.15 eV. Whether these observations may be related with the discrepancy in the apparent time scale of the NSE and dielectric experiments remains to be seen. 

Allison, S.A. (1986) Brownian dynamics simulation of wormlike chains. Fluorescence depolarization and depolarized light scattering. Macromolecules 19, 118-124. 

Single-bilayer DODAC (6) vesicles Magnetite particles prepared in situ in vesicles from Fe2+/Fe3+ and OH" Static and dynamic polarized and depolarized light scattering and static and time-resolved dichroic anisotropy, as well as conventional magnetization vs applied magnetic field determinations were used for characterization 794... 

Today generator matrices F are known for many properties,10 among them the population of different conformers, the relative stability of macromolecular diastereoisomers, the mean-square end-to-end distance, the radius of gyration, the molecular dipole moment, the molecular optical anisotropy (and, with it, the stress-optical coefficient, the Kerr effect, depolarized light scattering, and the... 

U. Bafile, L. Ulivi, M. Zoppi, M. Moraldi, and L. Frommhold. The third virial coefficients of collision-induced, depolarized light scattering of hydrogen. Phys. Rev. A, 44 4450, 1991. 

N. Meinander and G. C. Tabisz. Information theory and line shape engineering approaches to spectral profiles of collision induced depolarized light scattering. Chem. Phys. Lett., 110 388, 1984. 

The overall crystallization behavior was studied by depolarized light intensity (DLI) and DSC (15,16,17). We observed a decrease in overall crystallization rate in the PBT-rich blends when the PET percentage... 

Keyes T, Kivelson D. Depolarized light scattering theory of the sharp and broad Rayleigh lines. I Chem Phys 1972 56 1057-1065. 

FP assays are known to be susceptible to artifacts (Turek-Etienne and Small, 2003). In principle, the assays are ratiometric and should normalize for variations in total excitation energy applied as would occur with inner filter effects, and newer generations of red-shifted fluorophores should help to eliminate interference (Vedvik et al., 2004). However, introducing a test compound with fluorescent or absorbent properties at 5 or 10 pM with the typically sub-micromolar concentrations of fluorophores in an FP assay can significantly skew the measurements. For example, if the compounds are insoluble, they can scatter and depolarize light. A concentration-dependent effect on an FP assay could result from an increase in the amount of insoluble compound. 

The (3-process provides a further puzzle There are almost no reports of its detection by depolarized light scattering, even though the latter is believed to probe the same molecular reorientation dynamics as DS. In part, this must be related to the fact that the relevant kilohertz-to-megahertz range is not easily accessible to LS. However, from the rare reports where LS and DS results of 13-processes are compared, it appears that (3-processes only weakly show up in LS, if at all [65,160,161]. As an example, Fig. 36 shows normalized correlation... 

Figure 49. Susceptibility spectra for propylene carbonate (Tg — 160 K) as measured by depolarized light scattering (top, data from Ref. 372) and dielectric spectroscopy (bottom, data from Ref. 9), each normalized by a temperature-independent static susceptibility. The full lines are fits from solutions of a two-component schematic MCT model. The dashed fines indicate a white noise spectrum. The dash—dotted line in the upper panel exhibits the asymptote of the critical spectrum. The dotted line shows the solution of the model at T — Tc with hopping terms being neglected. (From Ref. 380.)...

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