Measurement of the physical properties of cyclohexane using a laser interferometric technique. II

The refractive index (n) and thermal coefficient of the refractive index (dn/dT) are measured at two laser wavelengths for the nonpolar laser dye solvent cyclohexane. The measurements are carried out using the modified laser Mach-Zehnder interferometric technique. The optical permittivity (epsilon) and its variation with temperature are calculated. Applying the Cauchy equation, the following refractive properties are obtained: the optical dispersion dn/d lambda, the dielectric dispersion d epsilon/d lambda, the variation of - dn/dT, d epsilon/dT as a function of wavelength (lambda), and Cauchy's constants against temperature. Additionally, molar refractivity and thermal volume expansion coefficient versus temperature and wavelength are determined. (C) 1998 Elsevier Science B.V. All rights reserved.