Knowledge Bank

Using results from our analysis of rotational and infrared spectra of $\nu 2,\nu 3,\nu 5,$ and $\nu 6$ we have fit the hot bands in the $\nu 6$ region near 774 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ originating in $\nu 2,$ $\nu 3,$ and $\nu 5$ as well as the $2\nu 6$ overtone band. Although the $2\nu 6$ state is perturbed by the nearby and as yet unassigned $\nu 2+\nu 3$ and $\nu 2+\nu 5$ states, a set of effective parameters was derived which adequately describes the $2\nu 6$ spectrum as well as the $2\nu 6-\nu 6$ hot band. These results improve the description of the $\nu 6$ spectrum, particularly in the Q-branch region. The molecular parameters will be presented and examples of spectra will be shown.