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Millimeter-Wave Spectrum of the NO Dimer

Brookes1, McKellar, Amano

  • 1Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, K1A 0R6, Canada

Journal of Molecular Spectroscopy
|September 1, 1997
PubMed
Summary

Researchers studied the pure rotational spectrum of the nitrogen monoxide (NO) dimer using millimeter-wave spectroscopy. This study significantly improved the understanding of the NO dimer

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Area of Science:

  • Molecular Spectroscopy
  • Physical Chemistry
  • Chemical Physics

Background:

  • The pure rotational spectrum of the nitrogen monoxide (NO) dimer was previously limited to a few microwave transitions.
  • Understanding the rotational dynamics and intermolecular potential of dimers is crucial in molecular physics.

Purpose of the Study:

  • To investigate the pure rotational spectrum of the NO dimer ((14N16O)2) in the millimeter-wave region.
  • To significantly improve the ground state parameters of the NO dimer by adding new spectral data.

Main Methods:

  • Direct absorption spectroscopy was employed in a supersonic jet expansion.
  • Measurements were conducted in the 225-400 GHz millimeter-wave frequency range.
  • Data analysis combined new millimeter-wave transitions with existing microwave and infrared data.

Main Results:

  • 66 new millimeter-wave transitions for the NO dimer were measured, with J values from 4 to 16 and Ka from 2 to 7.
  • Most transitions appeared as single lines, with some exhibiting partially resolved hyperfine structure.
  • An improved set of ground state parameters was obtained, including the first sextic distortion parameters.

Conclusions:

  • The study significantly enhanced the characterization of the NO dimer's ground state properties.
  • The inclusion of millimeter-wave data provided a more precise determination of the dimer's rotational constants and distortion parameters.

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