Evidence for non-local-thermodynamic-equilibrium rotation in the OH nightglow

Details Evidence for non-local-thermodynamic-equilibrium rotation in the OH nightglow Evidence for non-local-thermodynamic-equilibrium rotation in the OH nightglow

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811567p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,567-11,579.

Physics

24

Hydroxyl Radicals, Nightglow, Nonequilibrium Thermodynamics, Rotational Spectra, Fourier Transformation, Ground Truth, Vibrational Spectra

Scientific paper

Attention is given to the unexpectedly intense transition from high rotational levels revealed by improved ground-based Fourier transform IR spectroscopic measurements of the OH Meinel Delta(nu) = 2 and 3 nightglow emissions. The measurements indicate that about 10 percent of the OH(X, nu-prime = 7) column rotational population is typically in rotation levels with N-prime not less than 7, in sharp contrast with the corresponding local thermodynamic equilibrum estimate of about 1 percent. The excess high-N-prime population also persists in the lower vibrational states of OH(X), as evidenced by the readily detectable high-P(1)(N-double prime) transitions in the (3,1) and (6,3) bands and by the presence of observable R branch heads in the (4,2) and (5,3) bands.

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