Scattering Rings in Birefringent Porous Silicon

2003 ◽  
Vol 762 ◽  
Author(s):  
Claudio J. Oton ◽  
Zeno Gaburro ◽  
Mher Ghulinyan ◽  
Nicola Daldosso ◽  
Lucio Pancheri ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Light Scattering ◽  
Porous Silicon ◽  
Direct Measurement ◽  
Optical Anisotropy ◽  
Oblique Incidence ◽  
Laser Light ◽  
Anisotropic Scattering ◽  
Scattering Measurements

AbstractWe report the observation of strongly anisotropic scattering of laser light at oblique incidence on (100)-oriented porous silicon layers. We performed angle-resolved light scattering measurements and three concentric rings were observed. Modeling porous silicon by means of nanometric columnar air pores and an effective anisotropic uniaxial dielectric constant explains the observed phenomenon, and besides, the observation of the angle aperture of these rings allows a direct measurement of relative birefringence. We finally study the changes of optical anisotropy after different modifications of the structure.

13C n.m.r. and g.p.c.—low-angle laser light scattering measurements on polyacrylonitrile prepared by urea clathrate polymerization in the solid state for the optimization of tacticity

Polymer ◽  
1995 ◽  
Vol 36 (12) ◽  
pp. 2343-2346 ◽  
Author(s):  
Masatomo Minagawa ◽  
Tōru Takasu ◽  
Satoshi Shinozaki ◽  
Fumio Yoshii ◽  
Norio Morishita
Keyword(s):  
Light Scattering ◽  
Solid State ◽  
Laser Light ◽  
Laser Light Scattering ◽  
Scattering Measurements

scholarly journals Light-scattering from detergent-complexed biological macromolecules

1984 ◽  
Vol 219 (3) ◽  
pp. 875-881 ◽  
Author(s):  
M N Jones ◽  
P J W Midgley
Keyword(s):  
Light Scattering ◽  
Ionic Strength ◽  
Laser Light ◽  
Aggregation Number ◽  
Biological Macromolecules ◽  
Rayleigh Light Scattering ◽  
Low Salt ◽  
Scattering Measurements ◽  
Detergent Micelles ◽  
Rayleigh Light

A theory is described for Rayleigh light-scattering from solutions of detergent-complexed macromolecules applicable to measurements carried out under conditions of Donnan equilibrium. The theory shows that when scattering measurements are made on detergent-solubilized macromolecules in the presence of detergent micelles the apparent Mr is dependent on the extent of detergent binding and effective charge on the detergent-macromolecule complex and the micellar charge and aggregation number. Equations are given for the apparent Mr of the macromolecule under limiting conditions of high salt and low salt concentration. Low-angle laser-light-scattering measurements were made on lysozyme complexed with sodium n-dodecyl sulphate both in the absence and in the presence of detergent micelles. These experimentally obtained data were used in conjunction with the detergent-binding isotherm to test the theory at high ionic strength. Light-scattering measurements were also made on detergent-saturated complexes as a function of ionic strength and pH. The results are in reasonable accord with both the qualitative and the quantitative predictions of the theory.

Spectrometer for laser-light scattering measurements of macromolecular and subcellular particle motions

1982 ◽  
Vol 20 (1) ◽  
pp. 37-43 ◽  
Author(s):  
D. B. Sattelle ◽  
G. R. Palmer ◽  
M. C. A. Griffin ◽  
R. E. D. Holder
Keyword(s):  
Light Scattering ◽  
Laser Light ◽  
Laser Light Scattering ◽  
Scattering Measurements
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