Abstract
FOR liquids, the Einstein theory1 of light scattering, the Gans theory2 of the Kerr effect and the Leontovitch theory3 of the Maxwell effect all require knowledge of the isothermal density derivative of the optical dielectric constant, ρ(∂n2/∂ ρ)T. Experimental values of this coefficient have been given for only a few liquids. In the past, resource has been made to dielectric equations of state, such as the Lorentz–Lorenz equation, which relate the dielectric constant to the density, in order to calculate this coefficient. Usually, the dielectric constant of a liquid is not a function of density only, however, but depends separately on pressure P and temperature T, so that the coefficients (∂n2/∂p)ϱ and (∂n2/∂T)ϱ are not zero4. For example, it has been shown5 that the use of the Lorentz–Lorenz equation in the Einstein light scattering equation may lead to errors of between 10 and 20 per cent,
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References
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MEETEN, G. Empirical Relation for the Isothermal Density Derivative of the Optical Dielectric Constant. Nature 218, 761 (1968). https://doi.org/10.1038/218761a0
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DOI: https://doi.org/10.1038/218761a0
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