Absorption of Infrared Radiation by D2O and HDO Mixed with Montmorillonite1

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Abstract
The frequency, u, for O-D stretching in D20 films between the superimposed layers of different micas and montmorillonites was measured at several film thicknesses and temperatures of 2 ~ and 25~ by infrared spectroscopy. The molar absorptivity, E, for O-D stretching in HDO films between the mont- morillonite layers was also measured at different film thicknesses and 25~ It was found that v is related to mw/mm, the mass ratio of D20 to mica or montmorillonite, by the equation u = u ~ exp/3/(mw/mm) where u ~ is the O-D stretching frequency in pure DeO and fl is a constant. Since mwlmm is proportional to a, the area under the absorption peak, mw/mm can be replaced by a in this equation. It was also found that decreased dramatically as the thickness of the water film between the montmorillonite layers decreased. These results were interpreted to mean that the structure of the interlayer water is perturbed by the inter- layer cations and/or silicate surfaces.

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