Light scattering by propanol solutions in water and heavy water

Vuks, M. F.; Shurupova, L. V.

doi:10.1007/bf00743683

Cited by 24 publications

(35 citation statements)

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“…3 and 4 represent the values of (Ρ2) for pure 8CB in the nematic phase estimated on the basis of the refractive indices measurements [38,39] by the use of the Vuks approximation [40].…”

Section: Resultsmentioning

confidence: 99%

Orientational Behaviour of the Guest-Host Systems in the Smectic A and Nematic Phases

1992

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The measurements of the polarized absorption and fluorescence components spectra for the guest-host mixtures have been used to study the long orientational order in the uniaxial phases of the liquid crystal. The temperature dependence of the order parameters, (Ρ2) and (Ρ 4 ), has been investigated and the molecular distribution function has been determined. On the basis of the (Ρ2) and (Ρ4), values some conclusions about the molecular orientation in the smectic A and nematic phases of the liquid crystalline samples have been drawn. It has been also found that the fluorescence spectroscopy is a sensitive method for determination of the phase transition temperatures of the liquid crystal doped with the fluorescent dye.

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“…3 and 4 represent the values of (Ρ2) for pure 8CB in the nematic phase estimated on the basis of the refractive indices measurements [38,39] by the use of the Vuks approximation [40].…”

Section: Resultsmentioning

confidence: 99%

Orientational Behaviour of the Guest-Host Systems in the Smectic A and Nematic Phases

1992

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“…Equation (36) gives the Clausius-Mossotti equation for refractive index at optical frequency ω as n 2 (ω) = 1 + 4πN f (ω)ᾱ(ω), or equivalently often called the Vuks equation for isotropic medium as n 2 − 1 / n 2 + 2 = (4π/3) Nᾱ in cgs unit system for E-amplitude representation. 61,62 The Clausius-Mossotti equation or the Vuks equation is used when there is no contribution from the permanent electric dipole moments to the linear polarization, either because the molecular system is nonpolar or because the frequency of the applied optical field is so high that the molecules cannot orient quickly enough to follow the change in the direction of the optical field.…”

Section: Linear Optical Polarizationmentioning

confidence: 99%

Rigorous theory of molecular orientational nonlinear optics

Kwak

Kim

2015

AIP Advances

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Classical statistical mechanics of the molecular optics theory proposed by Buckingham [A. D. Buckingham and J. A. Pople, Proc. Phys. Soc. A 68, 905 (1955)] has been extended to describe the field induced molecular orientational polarization effects on nonlinear optics. In this paper, we present the generalized molecular orientational nonlinear optical processes (MONLO) through the calculation of the classical orientational averaging using the Boltzmann type time-averaged orientational interaction energy in the randomly oriented molecular system under the influence of applied electric fields. The focal points of the calculation are (1) the derivation of rigorous tensorial components of the effective molecular hyperpolarizabilities, (2) the molecular orientational polarizations and the electronic polarizations including the well-known third-order dc polarization, dc electric field induced Kerr effect (dc Kerr effect), optical Kerr effect (OKE), dc electric field induced second harmonic generation (EFISH), degenerate four wave mixing (DFWM) and third harmonic generation (THG). We also present some of the new predictive MONLO processes. For second-order MONLO, second-order optical rectification (SOR), Pockels effect and difference frequency generation (DFG) are described in terms of the anisotropic coefficients of first hyperpolarizability. And, for third-order MONLO, third-order optical rectification (TOR), dc electric field induced difference frequency generation (EFIDFG) and pump-probe transmission are presented. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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“…Vuks made a bold assumption that the internal field in a crystal is the same in all directions. With this assumption, he derived the following equation for anisotropic medium [14] which relates ordinary and extraordinary refractive indices to the corresponding polarizabilities:…”

Section: Modified Four-parameter Modelmentioning

confidence: 99%

“…The second procedure employed for the determination of order parameter is Haller's extrapolation method [13]. In this method the well--known relation given by Vuks is used [14]. Temperature dependent experimental results of all these parameters are linked with the theoretical value.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Optical Parameters of Liquid Crystals

Kumar¹

2007

Acta Phys. Pol. A

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Validation of a modified four-parameter model describing temperature effect on liquid crystal refractive indices is being reported in the present article. This model is based upon the Vuks equation. Experimental data of ordinary and extraordinary refractive indices for two liquid crystal samples MLC-9200-000 and MLC-6608 are used to validate the above-mentioned theoretical model. Using these experimental data, birefringence, order parameter, normalized polarizabilities, and the temperature gradient of refractive indices are determined. Two methods: directly using birefringence measurements and using Haller's extrapolation procedure are adopted for the determination of order parameter. Both approches of order parameter calculation are compared. The temperature dependences of all these parameters are discussed. A close agreement between theory and experiment is obtained.

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Light scattering by propanol solutions in water and heavy water

Cited by 24 publications

References 1 publication

Orientational Behaviour of the Guest-Host Systems in the Smectic A and Nematic Phases

Orientational Behaviour of the Guest-Host Systems in the Smectic A and Nematic Phases

Rigorous theory of molecular orientational nonlinear optics

Calculation of Optical Parameters of Liquid Crystals

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