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

Abstract

The refractive index ( n) and thermal coefficient of the refractive index (d n/d T) 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 ( ϵ) and its variation with temperature are calculated. Applying the Cauchy equation, the following refractive properties are obtained: the optical dispersion d n/d λ, the dielectric dispersion d ϵ/d λ, the variation of −d n/d T, d ϵ/d T as a function of wavelength ( λ), and Cauchy's constants against temperature. Additionally, molar refractivity and thermal volume expansion coefficient versus temperature and wavelength are determined.