Infrared intensities of the fundamental vibrations of liquid H2O |
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Authors: | Toshio Motojima Shun-Ichi Ikawa Masao Kimura |
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Institution: | Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060, Japan |
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Abstract: | Infrared absorption intensities of the fundamental vibrations of liquid H2O have been obtained by measuring transmissions at two sample thicknesses (about 9 and 0.9 μ). The effect of multiple internal reflections on the observed absorptions is examined in terms of thin-film optics. It is shown that this simple method yields precise absorption intensities, without corrections for the effects of multiple internal reflections. The resulting intensities are 89.9 × 103 cm/mmol and 5.91 × 103 cm/mmol for the stretching and bending vibrations, respectively. The latter value was estimated after eliminating the absorption of intermolecular vibrations from the 1400–2400 cm-1 region by means of computer simulation. |
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