HIGH-RESOLUTION SPECTRA OF MOLECULAR ANIONS: ANOMALOUS ASYMMETRY SPLITTING IN $HNO^{-}$
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Date
1997
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Ohio State University
Abstract
Extensive measurements have been made of the infrared vibrational-rotational spectra of the $H^{14}NO^{-}$ and $H^{15}NO^{-}$ anions. The spectra were obtained using autodetachment spectroscopy, in which vibrational-rotational transitions are excited using a coaxial ion beam/infrared laser beam spectrometer. The vibrationally excited ions autodetach, producing a fast neutral which is detected. A total of 413 transitions have been measured in the fundamental N-H stretch. The measurements have sub-Doppler resolution, enabling the measurement of the asymmetry splitting. The asymmetry splitting, and rotational constants returned by a least-squares fit to the spectra, manifest an anomalously large dependence of the rotational constants upon isotopic substitution. The spectrum may be perturbed by a Coriolis interaction. Comparison is made with theoretical calculation $^{m}$ of the geometry of this species.
Description
$^{m}$K. A. Robins, J. W. Farley, and J. L. Toto, J. Chem. Phys. 99, 9770 (1993).
Author Institution: Department of Physics, University of Nevada; Department of Physics, Air Liquide Laboratories
Author Institution: Department of Physics, University of Nevada; Department of Physics, Air Liquide Laboratories