Complex refractive indices in the infrared for ZnCl2 in water

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Abstract
Near‐normal incidence reflectance spectra relative to water were measured throughout the 270?ν?5000 cm−1 spectral region for 20.3%, 29.4%, and 40.2% aqueous solutions of ZnCl2. Spectral values of the complex refractive index N (ν) =n (ν)+ik (ν) of the ZnCl2 solutions were computed by use of subtractive Kramers–Kronig techniques. Values of N (ν) were obtained in a form suitable for future computations of Mie scattering in a cloud composed of aqueous ZnCl2 droplets. The spectra were further analyzed to determine the central frequencies, half‐widths, and strengths of infrared bands due to the fundamental intra‐ and intermolecular vibrational modes of liquid water.