An improved experimental method for reflection dispersive Fourier transform spectrometry of very heavily absorbing liquids
Résumé
An experimental method for the determination of the complex refractive index of a very heavily absorbing liquid at submillimetre wavelengths by dispersive Fourier transform reflection spectrometry is described. The method is superior to earlier dispersive reflection methods for liquids in that it avoids the collection of redundant data. This results in a halving of the experimental time, a reduced susceptibility to certain systematic errors and a small reduction in the random noise present in the derived values of the optical constants. The method is illustrated by the results of the determination of the optical constants of pure water and of a 5 M aqueous solution of NaCl in the spectral range between 50 and 400 cm−1.