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 $117 {\mathrm{cm}}^{-1}$). Transitions within the rotational manifold of both the ground and the ${\nu }_2=1$ 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

Rotational and vibrational dependences of collisional linewidths in the nν₂–(n − 1)ν₂ hot bands of H₂O from Fourier-transform flame spectra

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