A determination of the spin-rotation parameters for NO2 in the X̃2A1 state by microwave-optical double resonance

J. M. Brown, T. C. Steimle, M. E. Coles, R. F. Curl

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48 Scopus citations


Magnetic dipole transitions between the spin components of rotational levels of NO2 in its ground state have been observed by the technique of microwave-optical double resonance. Fluorescence induced by an argon ion laser was used to monitor the process. Observations were made in the range 4 to 12 GHz and provide information on levels with a wide spread of N and K a values. The results have been used in conjunction with the known electric dipole transition frequencies and some recent data from radio frequency-infrared double resonance to determine the rotational and spin-rotational parameters for the molecule in its ground state. It has proved possible to determine all the three quadratic and six quartic parameters in the spin-rotational Hamiltonian. The improvement in knowledge of the spin-rotation intervals allow a refinement of the Zeeman parameters for NO2 by refitting the data from the EPR and LMR spectra. The results are in good agreement with the relationships gSaa=g saa/2Baa, etc.

Original languageEnglish (US)
Pages (from-to)3668-3672
Number of pages5
JournalThe Journal of chemical physics
Issue number7
StatePublished - Jan 1 1981
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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