Radiative Recombination in the Terrestrial Nightglow: e + O^+ arrow O + hν

Details Radiative Recombination in the Terrestrial Nightglow: e + O^+ arrow O + hν Radiative Recombination in the Terrestrial Nightglow: e + O^+ arrow O + hν

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..geclw1005s&link_type=abstract

American Physical Society, 56th Gaseous Electronics Conference, October 21-24, 2003, San Francisco, California, MEETING ID: GEC0

Computer Science

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Large aperture telescopes have been equipped with superbly calibrated high-resolution spectrographs with performance comparable with the best laboratory instrumentation. From analysis of spectra of the ``empty sky" (really the Earth's atmosphere) we have made the first experimental determination of the relative strengths of 25 emission lines between 390 and 930 nm from Rydberg excited states following the reaction e + O^+ arrow O + hν in the terrestrial ionosphere. We observe ns,np,nd arrow 3s,3p orbital transitions, around the O^+(^4S) core, for n=3-11 and for triplet and quintet overall spin. Two modern calculations of cross sections for radiative recombination are in use by atmospheric scientists [1] and astronomers [2]. In general, the observed relative intensities agree rather well with theory, especially for the quintet states. Modeling the triplets is complicated by optical trapping. Supported by the NSF and NASA. [1] V. Escalante and G. A. Victor, Planet. Space Sci. 40, 1705 (1992). [2] D. Pequignot, P. Petitjean, and C. Boisson, Astron. Astrophys. 251, 680 (1991).

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