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A PARTIAL ANALYSIS OF HONO BANDS BETWEEN 750 AND $1300 cm^{-1}$

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/9584

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Title: A PARTIAL ANALYSIS OF HONO BANDS BETWEEN 750 AND $1300 cm^{-1}$
Creators: Chan, W. H.; Mathews, C. W.; Nordstrom, R. J.
Issue Date: 1976
Abstract: Nitrous acid (HONO) has been proposed to be a significant source of HO-radicals in sunlight-irradiated, $NO_{X}$-rich exhaust gases $environments.^{1}$ To facilitate the identification and detection of this molecule in the atmosphere, moderately high resolution ($0.125 cm^{-1}$) spectra were obtained in the mid-IR region by Fourier transform spectroscopy using a path length of 43 m and a nitrous acid concentration of $< 5 \times 10^{-5}$ atm. The $\nu_{4}$ bands of both the trans- and the cis-isomers (at 790 and $852 cm^{-1}$, respectively) and the $\nu_{3}$ band of the trans-isomer (at $1263 cm^{-1}$) are A-type transitions and are mildly degraded to higher energies. The positions and relative intensities of these bands are in agreement with the assignments by McGraw $et al.^{2}$ A partial rotational analysis of each of these bands has been carried out using Watson’s Hamilton and the lower state constants given by Cox $et al.^{3}$ A much weaker band of HONO has also been observed near $1068 cm^{-1}$. This band exhibits B-type structure and it is rather strongly degraded to lower energies. A preliminary analysis of the $^{P}Q$ and $^{r}Q$ heads suggests that it is an overtone band due to $2\nu_{6}$ of the trans-isomer.
URI: http://hdl.handle.net/1811/9584
Other Identifiers: 1976-FC-6
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