Okumura, M. and Rehfuss, B. D. and Dinelli, B. M. and Bawendi, M. G. and Oka, T. (1989) Difference frequency laser spectroscopy of the nu3 fundamental band of NH<sup> + </sup><sub>2</sub>. Journal of Chemical Physics, 90 (11). pp. 5918-5923. ISSN 0021-9606 http://resolver.caltech.edu/CaltechAUTHORS:OKUjcp89
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The nu3 band of NH<sup> + </sup><sub>2</sub> in the X-tilde 3B1 ground electronic state was observed in direct absorption with a tunable difference frequency laser spectrometer in the 3 µ region, using velocity modulation detection. NH<sup> + </sup><sub>2</sub> and NH<sup> + </sup><sub>3</sub> ions were generated in an ac discharge of He and NH3, or of He, N2, and H2. Fifty-three rovibrational transitions were measured and fit to a triplet A-reduced Hamiltonian to determine rotational, centrifugal distortion, and spin–rotation constants. The band origin was found to be nu0=3359.932 cm^−1, in excellent agreement with a recent calculation of Jensen, Bunker, and McLean. Indirect evidence from the spectrum suggested that NH<sup> + </sup><sub>2</sub> is quasilinear, but selection rules prevented a determination of the A rotational constant.
|Additional Information:||Copyright © 1989 American Institute of Physics. Received 14 September 1988; accepted 3 January 1989. We would like to thank P.R. Bunker and P. Jensen for providing us with results of their calculations prior to publication, and G. Herzberg for interesting discussions on his unpublished UV spectra. This work was supported by NSF Grant No. PHY-87-07025.|
|Subject Keywords:||NITROGEN HYDRIDES, MOLECULAR IONS, CATIONS, INFRARED SPECTRA, ROTATIONAL STATES, VIBRATIONAL STATES, SPECTRAL FUNCTIONS, SELECTION RULES|
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|Deposited On:||17 Apr 2008|
|Last Modified:||26 Dec 2012 09:58|
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