Effective photodissociation cross sections for molecular oxygen and nitric oxide in the Schumann-Runge bands

Details Effective photodissociation cross sections for molecular oxygen and nitric oxide in the Schumann-Runge bands Effective photodissociation cross sections for molecular oxygen and nitric oxide in the Schumann-Runge bands

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jats...39.2066a&link_type=abstract

Journal of the Atmospheric Sciences, vol. 39, Sept. 1982, p. 2066-2075.

Physics

Optics

83

Atmospheric Optics, Molecular Gases, Nitric Oxide, Oxygen, Particle Size Distribution, Photodissociation, Schumann-Runge Bands, Atmospheric Attenuation, Atmospheric Chemistry, Atmospheric Composition, Atmospheric Models, Opacity, Solar Radiation, Spectral Line Width

Scientific paper

Accurate calculations of the atmospheric opacity and the photodissociation rate of molecular oxygen in the Schumann-Runge bands (175-205) are necessary for modeling chemistry in the terrestrial upper atmosphere. The present investigation is concerned with a single simple parameterization of effective cross sections which can be used to calculate both O2 opacity and dissociation rates. Use is made of a zenith angle dependent factor which accounts for variations shown in detailed calculations. The conducted analysis is based on the results of Frederick and Hudson (1980). Attention is given to molecular oxygen effective cross sections and nitric oxide effective cross sections. It is found that the depth of the atmosphere to which solar radiation in the 175-200 nm spectral region penetrates is a sensitive function of the rotational line widths in the Schumann-Runge bands. The oscillator strength for each band measures the cross section integrated over the band while the line width determine how the absorption is distributed in wavenumber.

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