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Observation of pure rotational absorption spectra in the ν2 band of hot H2O in flames

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Abstract

We present measurements of absorption spectra of hot-water vapor generated in a propane–air flame in the far-infrared region of the spectrum from 0.1 to 3.5 THz (3.3 to 117 cm-1). Transitions within the rotational manifold of both the ground and the ν2=1 vibrational levels were observed. The measurements are in good agreement with calculations of the predicted absorption spectra at 1300 K based on tabulated line intensities, whereas predicted theoretical line widths were found to be approximately one third too narrow.

© 1998 Optical Society of America

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