HIGH RESOLUTION SPECTRUM OF THE a-, b-TYPE HYBRID $O-H$ STRETCHING BAND OF HOCl,
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Date
1992
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Publisher
Ohio State University
Abstract
Trace concentrations of HOCl have recently been detected in the $stratosphere^{1}$. In order to improve the spectral data set available for this molecule, we have recorded the a-, b-type hybrid $v_{1}$ band of HOCl at $3609 cm^{-1}$ with a resolution of $0.004 cm^{-1}$, and the spectra of both the $^{35}cl$ and $^{37}cl$ isotopic species have been completely assigned. The spectra were produced by allowing a mixture of $Cl_{2}O$ and $H_{2}O$ to equilibrate in a multipass cell and were calibrated against recent water vapor measurements of $Toth_{2}$. The absolute wave number accuracy appears to be better than $\pm$$0.001 cm^{-1}$. Ground state combination differences obtained have been combined with the extensive microwave data of Gillis Singbeil $et al.^{3}$, and fit with a Watson Hamiltonian in the S reduction to obtain a significantly improved set of ground state centrifugal distortion constants through $p_{8}$ terms. Upper state rotational constants have also been obtained. The standard deviation of the fittings is better than $\pm$$0.0004 cm^{-1}$. For the $^{35}Cl$ isotopic species, a number of $K=2$ levels in the vicinity of $J=25$ have been found to be shifted by a weak resonance.
Description
1. G.C. Toon \& C.B. Farmer, Geophys. Res. Lett. 16 , 1375(1989). 2. R. Toth, private communication. 3. H.E. Gillis Singbeil et al., J. Mol. Spectrosc., 103 , 466(1984).
Author Institution: Metrology Research Institute, Helsinki University of Technology; Molecular Physics Division, National Institute of Standards and Technology; Aeronomy Laboratory National Oceanic and Atmospheric Administration, National Institute of Standards and Technology
Author Institution: Metrology Research Institute, Helsinki University of Technology; Molecular Physics Division, National Institute of Standards and Technology; Aeronomy Laboratory National Oceanic and Atmospheric Administration, National Institute of Standards and Technology