The N(2D°-4S°) 520 nm forbidden doublet in the nightglow: An experimental test of the theoretical intensity ratio

Details The N(2D°-4S°) 520 nm forbidden doublet in the nightglow: An experimental test of the theoretical intensity ratio The N(2D°-4S°) 520 nm forbidden doublet in the nightglow: An experimental test of the theoretical intensity ratio

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3212106s&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 12, CiteID L12106

Physics

5

Atmospheric Composition And Structure: Airglow And Aurora, Ionosphere: Ion Chemistry And Composition (0335), Ionosphere: Instruments And Techniques

Scientific paper

The ratio of intensities of the optically forbidden lines N(2D°-4S°) 519.8, 520.0 nm has been measured with high precision in the nightglow in repeated observations made with the High Resolution Echelle Spectrophotometer (HIRES) and Echellette Spectrograph and Imager (ESI) on the Keck I and Keck II telescopes, respectively, at the W.M. Keck Observatory on Mauna Kea, Hawaii. The observed intensity ratio, I(519.8 nm)/I(520.0 nm), is seen to vary little over the bulk of any particular night, with a value of 1.759 +/- 0.014 determined over all observations. Among theoretical predictions of the ratio, this agrees best with a value of 1.788 determined from the ratio of products of recent Breit-Pauli calculation-derived spontaneous emission coefficients (Froese Fischer and Tachiev, 2004) and statistical weights of the fine structure levels of the 2D° term, under the assumption that these levels' populations are thermalized by rapid mixing through collisions with N2.

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