Herzberg continuum cross section of oxygen in the wavelength region 193.5-204.0 nm - New laboratory measurements and stratospheric implications

Details Herzberg continuum cross section of oxygen in the wavelength region 193.5-204.0 nm - New laboratory measurements and stratospheric implications Herzberg continuum cross section of oxygen in the wavelength region 193.5-204.0 nm - New laboratory measurements and stratospheric implications

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..580c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, June 1984, p. 580-582. Research supported by the Chemical Manufacturers

Physics

Optics

11

Absorption Cross Sections, Continuous Spectra, Herzberg Bands, Oxygen Spectra, Stratosphere, Ultraviolet Spectroscopy, Atmospheric Optics, Chlorofluorocarbons, Pressure Effects, Schumann-Runge Bands

Scientific paper

The absorption cross section of oxygen at 300K and at pressures in the range 50 - 760 torr has been measured throughout the wavelength region 193.5 - 204.0 nm. The absorption features in this region are the discrete lines of some Schumann-Runge bands and two underlying dissociation continua, viz., the weak Herzberg continuum of oxygen and a pressure dependent continuum involving two molecules of oxygen. Analysis of the pressure dependence of the total continuum cross section yields the Herzberg continuum cross section, which decreases monotonically from 14 barn at 193.58 nm to 5.5 barn at 204.06 nm. The acceptance of reduced Herzberg continuum cross sections implies significant changes in photochemical modelling predictions of the stratosperic concentrations and altitude profiles of ozone, chlorofluorocarbons and nitrous oxide.

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