The O(1S - 1D,3P) Line Intensity Ratio

Details The O(1S - 1D,3P) Line Intensity Ratio The O(1S - 1D,3P) Line Intensity Ratio

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa43a..02s&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA43A-02

Mathematics

Probability

0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 2407 Auroral Ionosphere (2704), 3359 Radiative Processes

Scientific paper

The line intensity ratio of the two optically-forbidden atmospheric emissions, O(1S-1D) at 557.7 nm and O(1S-3P) at 297.2 nm, must be a single-valued number in the upper atmosphere because the upper level is common to both lines. The calculated transition probability ratio A(557.7)/A(297.2) is 16, by several authors, and the ratio found in the laboratory is significantly larger. Field observations require space-based instruments, in which case calibration between the two wavelengths is the critical issue. We circumvent this problem by using the O2 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) lead to A(557.7)/A(297.2) ratios that are consistently much smaller than the calculated value. These results have consequences for auroral and dayglow processes, and it is particularly important to ascertain the cause of the substantial difference between theory and observation.

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