# NEW INFRARED OBSERVATIONS OF THE $H_{3}$ MOLECULE

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 Title: NEW INFRARED OBSERVATIONS OF THE $H_{3}$ MOLECULE Creators: Majewski, W. A.; Watson, J. K. G. Issue Date: 1987 Publisher: Ohio State University Abstract: The new hollow-cathode discharge source described at previous Symposia1 gives many infrared lines of the $H_{3}$ neutral molecule as well as of the vibration-rotation spectrum of the $H_{3}^{+} ion^{2}$. The former are mostly lines of the known $3s^{2}A_{1} \rightarrow 3p^{2}E^{\prime}$ and $3d(^{2}A^{\prime}_{J}, ^{2}E^{\prime\prime}, ^{2}E^{\prime}) \rightarrow 3p^{2}E^{\prime}$ electronic $transitions^{3,4}$, but the higher rotational temperature in the new source makes it possible to extend the previous assignments to higher N levels. The quality of the fit of the spectrum is not significantly improved by introducing additional parameters, suggesting that there are many small but irregular perturbations. A new group of lines near 4300 cm-1 is assigned to the electronic transition $4p^{2}E^{\prime} \rightarrow 3s^{2}A^{\prime}_{j}$, This is the first observation of an $n = 4$ state of $H_{3}$. $^{1}$ papers TE7 (1985) and RE5 (1986). $^{2}$ W.A. Majewski, M.D. Marshall, A.R.W. McKellar, J.W.C. Johns, and J.K.G. Watson, J. Mol. Spectrosc., in press. $^{3}$ G. Herzberg, H. Lew, J.J. Sloan, and J.K.G. Watson, Can. J. Phys. 59, 428 (1981). $^{4}$ G.Herzberg, J.T. Hougen, and J.K. G. Watson, Can. J. Phys. 60. 1261 (1982). Description: Author Institution: Department of Chemistry, University of Pittsburgh; Herzberg Institute of Astrophysics, National Research Council of Canada URI: http://hdl.handle.net/1811/17405 Other Identifiers: 1987-WF-3