scholarly journals Spectral Distribution of Scattered Light from a Chemical Relaxation System

2011 ◽  
Author(s):  
Wilson Marques ◽  
Gilberto M. Kremer ◽  
Miriam Pandolfi Bianchi ◽  
Ana Jacinta Soares
Keyword(s):  
Spectral Distribution ◽  
Scattered Light ◽  
Relaxation System ◽  
Chemical Relaxation

Spectral distribution of scattered light by fluid mixtures of correlated atoms and molecules

1981 ◽  
Vol 59 (11) ◽  
pp. 1620-1626 ◽  
Author(s):  
S. Kielich ◽  
T. Bancewicz ◽  
S. Woźniak
Keyword(s):  
Spectral Distribution ◽  
Scattered Light ◽  
Stochastic Theory ◽  
Coherent Scattering ◽  
Time Correlation ◽  
Isotropic Scattering ◽  
Polarizability Tensor ◽  
Spectral Structure ◽  
Atoms And Molecules ◽  
Electric Multipoles

A stochastic theory of the spectral distribution of light scattered by mixtures of atoms and molecules, colliding in time and space, is proposed. New time-correlation functions C(0)(t) and C(2)(t) are introduced describing respectively the statistical microscopic mechanisms of isotropic and anisotropic coherent scattering, related with changes in the first and second perturbation of the molecular polarizability tensor due to the long-range fields of induced molecular electric multipoles. In this way, not only anisotropic but also isotropic scattering is shown to have a rotational spectral structure due to orientational motions and angular collisions of the polar molecules. The hitherto not considered cross approximations 0,1 and 0,2 of the functions C(0)(t) and C(2)(t) involve the first power of the dipole–quadrupole, dipole–octupole, and quadrupole–quadrupole tensors thus permitting first determinations of the signs of the successive multipolar molecular polarizabilities.

Magnetic resonance in the noise in the intensity of scattered light

1987 ◽  
Vol 153 (10) ◽  
pp. 363 ◽  
Author(s):  
Evgenii B. Aleksandrov ◽  
V.S. Zapasskii
Keyword(s):  
Magnetic Resonance ◽  
Scattered Light

A Time-Resolved Low-Angle Light Scattering Apparatus. Application to Phase Separation Problems in Polymer Systems

2001 ◽  
Vol 66 (6) ◽  
pp. 973-982 ◽  
Author(s):  
Čestmír Koňák ◽  
Jaroslav Holoubek ◽  
Petr Štěpánek
Keyword(s):  
Phase Separation ◽  
Light Scattering ◽  
Signal To Noise Ratio ◽  
Scattered Light ◽  
Ccd Camera ◽  
Time Resolved ◽  
Polymer Systems ◽  
Software Analysis ◽  
Phase Separation Kinetics ◽  
Small Angle Light Scattering

A time-resolved small-angle light scattering apparatus equipped with azimuthal integration by means of a conical lens or software analysis of scattering patterns detected with a CCD camera was developed. Averaging allows a significant reduction of the signal-to-noise ratio of scattered light and makes this technique suitable for investigation of phase separation kinetics. Examples of applications to time evolution of phase separation in concentrated statistical copolymer solutions and dissolution of phase-separated domains in polymer blends are given.

Nondiffusive Brownian Motion Studied by Diffusing-Wave Spectroscopy

1989 ◽  
Vol 177 ◽  
Author(s):  
D. J. Pine ◽  
D. A. Weitz ◽  
D. J. Durian ◽  
P. N. Pusey ◽  
R. J. A. Tough
Keyword(s):  
Autocorrelation Function ◽  
Colloidal Particles ◽  
Scattered Light ◽  
Short Time Scale ◽  
Velocity Autocorrelation Function ◽  
Velocity Autocorrelation ◽  
Power Law Decay ◽  
Brownian Particles ◽  
Short Time ◽  
Surrounding Fluid

ABSTRACTOn a short time scale, Brownian particles undergo a transition from initially ballistic trajectories to diffusive motion. Hydrodynamic interactions with the surrounding fluid lead to a complex time dependence of this transition. We directly probe this transition for colloidal particles by measuring the autocorrelation function of multiply scattered light and observe the effects of the slow power-law decay of the velocity autocorrelation function.

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