The Photoabsorption Spectrum of N2 in 105-140 nm: The Tanaka and LBH systems and Production of the 2PB Fluorescence

Details The Photoabsorption Spectrum of N2 in 105-140 nm: The Tanaka and LBH systems and Production of the 2PB Fluorescence The Photoabsorption Spectrum of N2 in 105-140 nm: The Tanaka and LBH systems and Production of the 2PB Fluorescence

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa71a..05c&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA71A-05

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0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0340 Middle Atmosphere: Composition And Chemistry

Scientific paper

The absorption spectrum of N2 in 105-140 nm consists of forbidden electronic transitions of X 1S-C 3P (Tanaka system) and X1S-a 1P (LBH) with absorption cross sections in the order of 10-20 cm2, and other weaker system involving the excited states B­Ý3œU, a­Ý1œU among others. Vibrational bands of v­Ý=0-3 in the Tanaka system and v­Ý=0-16 in the LBH (Lyman-Birge-Hopfield) were resolved. The absorption process in the C state produces UV fluorescence caused because of the transitions of C-B (2nd positive bands) with unity quantum yield. The process should contribute to the N2 dayglow in the thermosphere in addition to electron impact excitation.

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