A COMBINED ANALYSIS OF THE $\nu_{1}, \nu_{3}$, AND $2\nu_{2}$ VIBRATIONAL STATES OF THE $NH_{2}$ RADICAL USING FOURIER TRANSFORM ABSORPTION AND EMISSION DATA

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1990

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Ohio State University

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The $\nu_{3} (\simeq 3301 cm^{-1})$ and $\nu_{1} (\simeq 3219 cm^{-1})$ fundamental bands of $NH_{2}$ 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 $2\nu_{2} (\simeq 2961 cm^{-1})$ 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 $(v_{1}v_{2}v_{3}) - (001), (100)$, and (020) vibrational states of $NH_{2}$. The analysis shows that extensive Coriolis mixing of (001) and (100) occurs for some rotational levels starting with $N \geq 4$, and that significant Fermi-type mixing of (100) and (020) occurs for certain levels with $N \geq 6$. 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 $K_{a} - 8$, and for (001) up to $N - 7, K_{a} - 4$.

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Author Institution: NOAA Aeronomy Laboratory, R/E/AL2, 325 Broadway. Boulder, Colorado 80303; and Cooperative Institute for Research in Experimental Sciences, University of Colorado, Boulder; Herzberg Institute of Astrophysics, National Research Council of Canada

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