INFRA-RED EMISSION SPECTRA OF $NH_{2}$
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Date
1984
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Ohio State University
Abstract
Fourier transform spectra of the emission of $NH_{2}$ have been recorded at high resolution using a Bomem spectrometer. In the special range $2600-3500 cm^{-1}$, transitions of the vibrational fundamental $\nu_{1}$ of $NH_{2}$ are observed as well as the $\nu_{1}$ and $\nu_{3}$ fundamentals of $NH_{3}$ and the $\Delta v = 1$ sequence of NH in its $X^{3}\Sigma^{-}$ electronic ground state. Only a few weak lines of the 110 - 010 band can be detected and no lines of the fundamental $\nu_{3}$ have been identified. Between 6000 and $10000 cm^{-1}$, the emission arises from the electronic transition $\widetilde{A}^{2}A_{1}-\widetilde{X}^{2}B_{1}$ of $NH_{2}$; the lines involve the lowest vibronic states of each $K_{a}$ value in the upper $\widetilde{A}^{2}A_{1}$ state and the 020 or 030 vibrational levels in the $\widetilde{X}^{2}B_{1}$ lower state. From the rotational analyses, improved molecular constants will be presented.
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Author Institution: Herzberg Institute of Astrophysics, National Research Council of Canada