Knowledge Bank

The $\nu 3(\simeq 3301cm-1)$ and $\nu 1(\simeq 3219cm-1)$ fundamental bands of $NH2$ have been measured at high resolution in Boulder using a Bomem Fourier transfora infrared spectrometer and a fast-flow multiple-traversal absorption cell. Extensive information in the form of combination differences has been obtained for the nearby $2\nu 2(\simeq 2961cm-1)$ state from emission spectra in the visible and near-infrared regions that were recorded in Ottawa, also using a Bomem spectrometer. The absorption and emission data were combined to perform the first simultaneous least-squares fit of the interacting $(v1v2v3)-(001),(100)$, and (020) vibrational states of $NH2$. The analysis shows that extensive Coriolis mixing of (001) and (100) occurs for some rotational levels starting with $N\ge 4$, and that significant Fermi-type mixing of (100) and (020) occurs for certain levels with $N\ge 6$. The molecular parameters and calculated energy levels obtained here give an accurate characterization of the rotational energy levels for (100) and (020) up to N - 9 and $Ka-8$, and for (001) up to $N-7,Ka-4$.