Knowledge Bank

The $\nu 2$ and $\nu 3$ bands of HOC1 have been studied with $0.004cm-1$ apodized resolution using the NBS DA3 002 BOMEM Fourier transform spectrometer. The $\nu 2$ band has been studied $previously,1$ while the high resolution spectrum of the $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}$ band is reported here for the first time. Although both a- and b-type transitions are permitted for both bands, only a-type transitions were observed. Transitions of both the $\mathrm{<mrow\; data-mjx-texclass="ORD">35</mrow>}$C1 and $\mathrm{<mrow\; data-mjx-texclass="ORD">37</mrow>}$C1 isotopic species were assigned. Results for the $\nu 2$ band are generally in good agreement with the results of Sams and $Dlson1$; however, due to the higher resolution avialable in this study, we were able to extend the line assignment to the K-7 transitions. The K-5 levels of the $\nu 2$ band of the $\mathrm{<mrow\; data-mjx-texclass="ORD">35</mrow>}$C1 species were found to be perturbed. This perturbation arises from an X-Y Coriolis resonance with the K=4 levels of the $2\nu 2$ state. The observed transitions were fit using a Watson S-Reduction Hamiltonian including terms through $P8$. The molecular constants will be reported.