Collision-induced transitions between the a1[Pi]g, a' 1[Sigma]-u, and w 1[Delta]u states of N2: Can they affect auroral N2 Lyman-Birge-Hopfield band emissions? [a^1\Pi _g a\prime ^1\Sigma ^-_u ^1\Delta _u N_2 N_2]

Details Collision-induced transitions between the a1[Pi]g, a' 1[Sigma]-u, and w 1[Delta]u states of N2: Can they affect auroral N2 Lyman-Birge-Hopfield band emissions? [a^1\Pi _g a\prime ^1\Sigma ^-_u ^1\Delta _u N_2 N_2] Collision-induced transitions between the a1[Pi]g, a' 1[Sigma]-u, and w 1[Delta]u states of N2: Can they affect auroral N2 Lyman-Birge-Hopfield band emissions? [a^1\Pi _g a\prime ^1\Sigma ^-_u ^1\Delta _u N_2 N_2]

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10126931e&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A12, p. 26931-26940

Other

21

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Thermosphere-Composition And Chemistry, Atmospheric Composition And Structure: Transmission And Scattering Of Radiation, Meteorology And Atmospheric Dynamics: Thermospheric Dynamics

Scientific paper

In the Earth's atmosphere bright ultraviolet (UV) emissions from the N2 a1Πg state (Lyman-Birge-Hopfield bands) are seen, but the w1Δu and a'1Σu- states, which have similar excitation cross sections, emit weakly if at all at UV wavelengths. Models of the singlet system (a, a', and w states) have used radiative cascade, which produces transitions between excited states, and quenching, which removes molecules from them, to explain the lack of emission from the a' and w states. Another process, which has never been properly included in such calculations, is collision-induced electronic transitions (CIET) between the singlet states. Recent laboratory measurements of CIET involving N2 indicate that the rate constants are comparable to those for radiation, and recent measurements have yielded enough information to allow a preliminary calculation of CIET between the N2 a1Πg, a'1Σu- and w1Δu states. These calculations show that CIET can be more important than radiation for transitions between the a, a', and w states in typical aurorae or up to the peak of typical dayglow emission profiles (~130km). The inclusion of CIET may allow self-consistent modeling of observations of the Lyman-Birge-Hopfield (LBH) bands, one of the most prominent ultraviolet molecular emissions from the Earth's atmosphere.

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