Abstract

Measurements of mid-infrared (MIR) absorption spectra of water and heavy water were carried out by fiber-optic evanescent wave spectroscopy, using silver halide (AgClBr) infrared fibers. Such measurements were performed for the first time on one sample, during the solid–liquid phase transition. From the variation of the spectra with temperature we found a new isosbestic point (at 3280 cm⁻¹ for H₂O or at 2475 cm⁻¹ for D₂O) and we identified five components of the O–H (O–D) stretch band. These phenomena have provided new information about the molecular structure of water.

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