Refractive index measurements in liquids within the frequency region 50 to 600 GHz; complex permittivity of C6H5Cl, CH3Cl and CH2Cl2

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Abstract
For a complete specification of molecular processes involved in rotational dynamics it is necessary to have both the absorption spectra and their dispersive counterparts for frequencies ranging from static to infrared. The authors describe an extension of their experimental set-up for measuring the absorption coefficient alpha over the frequency range 50-600 GHz to measure also the refractive index n. They are now thus able to bridge the gap in complex permittivity data between the microwave and the far-infrared domains. Refractive index is measured using the polarising Martin Puplett interferometer in monochromatic mode of operation, with accuracies of better than 1% over all the covered frequency range. Results of calibration measurements with liquid chlorobenzene (C6H5Cl) and sample absorption-dispersion data for two other liquids, chloromethane (CH3Cl) and dichloromethane (CH2Cl2), are also presented.