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Millimeter and submillimeter wave spectroscopy of HNC and DNC in the vibrationally excited states

The rotational transitions of hydrogen isocyanide (HNC) and deuterium isocyanide (DNC) in the vibrationally excited states as well as in the ground states were observed in the millimeter and submillimeter wave region. These compounds were generated in a dc glow discharge plasma containing hydrogen (...

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Published in:The Journal of chemical physics 1993-09, Vol.99 (5), p.3268-3271
Main Authors: OKABAYASHI, T, TANIMOTO, M
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Language:English
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description The rotational transitions of hydrogen isocyanide (HNC) and deuterium isocyanide (DNC) in the vibrationally excited states as well as in the ground states were observed in the millimeter and submillimeter wave region. These compounds were generated in a dc glow discharge plasma containing hydrogen (or deuterium), nitrogen, and carbon atoms. The stretching vibrational modes, ν1 and ν3 states, were selectively excited in the discharge plasma; on the other hand, the bending mode ν2 state was thermally populated at the cell temperature. The precise rotational, centrifugal distortion and l-type doubling constants were obtained for all of the first vibrationally excited states as well as the ground states. The experimental equilibrium rotational constants Be are 45 496.7769(45) and 38 207.7217(105) MHz for HNC and DNC, respectively, where uncertainties correspond to one standard deviation. The equilibrium internuclear distances are also determined to be re (H–N)=0.996 0643(29) Å and re (N≡C)=1.168 3506(16) Å.
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subjects Atomic and molecular physics
Exact sciences and technology
Molecular properties and interactions with photons
Physics
Properties of molecules and molecular ions
Rotation, vibration and vibration-rotation constants
title Millimeter and submillimeter wave spectroscopy of HNC and DNC in the vibrationally excited states
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