Optical detection and comparison of rare gas clathrate hydrate interfacial films with those of the simple n-alkane series

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Abstract
Stable rare gas clathrate hydrate films adsorbed on a glass surface have been successfully produced under saturated air–gas dynamic equilibrium flow conditions at room temperature and atmospheric pressure. With the exception of helium, these structures could be detected by transmittance changes employing the technique of total internal multiple reflection. It is shown experimentally that the measured transmittance variations between these hydrated gas films depend nearly linearly on their molar refractions as contrasted with the previously studied simple n‐alkane series, which exhibited a highly nonlinear behavior as a function of molar refraction. The differences in the optical behavior contrasted between these two series of nonpolar gases were compared with their measured bulk solubility properties in water as a function of their size and shape within the clathrate structure.