O(1S -> 1D,3P) branching ratio as measured in the terrestrial nightglow

Details O(1S -> 1D,3P) branching ratio as measured in the terrestrial nightglow O(1S -> 1D,3P) branching ratio as measured in the terrestrial nightglow

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgra..11112318s&link_type=abstract

Journal of Geophysical Research, Volume 111, Issue A12, CiteID A12318

Physics

12

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Processes: Radiative Processes

Scientific paper

The branching ratio of the two optically forbidden atmospheric emission lines, O(1S - 1D) at 557.7 nm and O(1S - 3P) at 297.2 nm, is a fixed number in the upper atmosphere because the O(1S) level is common to both lines. The value for the ratio A(557.7)/A(297.2) currently recommended by NIST is 16.7, and the ratio found in the laboratory is somewhat larger. Field observations require space-based instruments, in which case calibration between the two wavelength regions is the critical issue. We circumvent this problem by using the O2(A-X) Herzberg I emission system as a bridge between the UV region below 310 nm and the ground-accessible region above that wavelength. These two spectral regions can be separately calibrated in terms of intensity, and the results of a disparate set of observations (satellite, rocket, ground-based sky spectra) lead to a quite consistent value of 9.8 +/- 1.0 for A(557.7)/A(297.2). This conclusion has consequences for auroral and dayglow processes and for spectral calibration. It is particularly important to ascertain the cause of the substantial difference between this value and those from theory.

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