Exact results for light scattering by dense systems of isotropic particles: How good is the DID model

1981 ◽  
Vol 59 (10) ◽  
pp. 1560-1562 ◽  
Author(s):  
T. Keyes ◽  
P. A. Madden
Keyword(s):  
Light Scattering ◽  
Lattice Gas ◽  
Dipole Model ◽  
Exact Results ◽  
Double Scattering ◽  
Dominant Mechanism ◽  
Simple Liquids ◽  
Dense Lattice ◽  
Exact Theory ◽  
Induced Dipole

An exact, computationally convenient, expression for light scattering by a dense lattice gas is presented. It is shown how the exact theory can be used as a benchmark to test the assumption always made so far, that "pair" or "double" scattering is the dominant mechanism for depolarization by simple liquids. The tenability of the dipole – induced dipole model may be determined by the outcome of the indicated test.

scholarly journals Space Charge Property of Polyethylene/Silica Nanocomposites at Different Elongations

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Can Wang ◽  
Youyuan Wang ◽  
Peng Fan ◽  
Ruijin Liao
Keyword(s):  
Particle Size ◽  
Space Charge ◽  
Dipole Model ◽  
Particle Sizes ◽  
Test Results ◽  
Silica Nanocomposites ◽  
Induced Dipole ◽  
Interface Characteristics ◽  
Space Charge Distribution ◽  
Charge Property

This paper prepares polyethylene/silica nanocomposites with concentrations of 3 wt% and 5 wt% by using silicon dioxide (SiO2) nanopowder (nanosilica) with particle sizes of 15 and 50 nm. Samples whose elongations are 3%, 6%, and 10% are prepared. Pulsed electroacoustic technique is applied to evaluate the space charge distribution in samples. Test results show that homocharge near electrodes is generated in the polyethylene/silica nanocomposites. Nanocomposites with a nanoparticle concentration of 3 wt% and particle size of 15 nm suppress the accumulation of space charge effectively. The amount of space charge in the samples increases with the increase in elongation. At an elongation of 10%, packet-like space charge is generated in polyethylene/silica nanocomposites with the concentration of 5 wt% and particle sizes of 15 and 50 nm. The packet-like space charge in nanocomposites whose particle size is 50 nm is more obvious than that in nanocomposites whose particle size is 15 nm. The experiment results are explained by applying interface characteristics, dipole model, and induced dipole model.

scholarly journals Mapping the Drude polarizable force field onto a multipole and induced dipole model

2017 ◽  
Vol 147 (16) ◽  
pp. 161702 ◽  
Author(s):  
Jing Huang ◽  
Andrew C. Simmonett ◽  
Frank C. Pickard ◽  
Alexander D. MacKerell ◽  
Bernard R. Brooks
Keyword(s):  
Force Field ◽  
Dipole Model ◽  
Polarizable Force Field ◽  
Induced Dipole

Theory of Intercollisional Interference Effects. III. Collision-Induced Light Scattering

1972 ◽  
Vol 50 (22) ◽  
pp. 2902-2913 ◽  
Author(s):  
J. Courtenay Lewis ◽  
J. Van Kranendonk
Keyword(s):  
Light Scattering ◽  
Hard Sphere ◽  
Hard Sphere Model ◽  
Relative Height ◽  
Interference Effects ◽  
Sphere Model ◽  
Scattering Spectrum ◽  
Induced Dipole ◽  
Direction Cosines ◽  
Light Scattering Spectrum

The kinetic theory of intercollisional interference effects in optical spectra of gases developed in two previous papers is extended to the collision-induced light scattering from monatomic gases. The quadratic dependence of the incremental polarizability on the direction cosines of the intermolecular axis, compared to the linear dependence for the induced dipole moment, makes the effect quite different for light scattering and absorption. For a hard-sphere model an intercollisional peak, rather than a dip, of a relative height of 25% and a width proportional to the density is predicted to appear on top of the intracollisional light scattering spectrum.

scholarly journals Anti-scattering effect analyzed with an exact theory of light scattering from rough multilayers

2019 ◽  
Vol 44 (18) ◽  
pp. 4455 ◽  
Author(s):  
G. Soriano ◽  
M. Zerrad ◽  
C. Amra
Keyword(s):  
Light Scattering ◽  
Exact Theory ◽  
Scattering Effect

Hyperpolarizabilities of extended molecular mechanical systems

2016 ◽  
Vol 18 (12) ◽  
pp. 8710-8722 ◽  
Author(s):  
Ignat Harczuk ◽  
Olav Vahtras ◽  
Hans Ågren
Keyword(s):  
Dipole Moments ◽  
Mechanical Systems ◽  
Second Order ◽  
Dipole Model ◽  
Point Dipole ◽  
Induced Dipole

The equations for decomposition of the molecular hyperpolarizabilty into atomic sites is derived alongside with equations to calculate the cluster hyperpolarizability as resulting from the second order induced dipole moments in the point-dipole model.

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