Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa53a1241y&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA53A-1241
Astronomy and Astrophysics
Astrophysics
[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0343] Atmospheric Composition And Structure / Planetary Atmospheres, [6281] Planetary Sciences: Solar System Objects / Titan, [7549] Solar Physics, Astrophysics, And Astronomy / Ultraviolet Emissions
Scientific paper
Lyman-Birge-Hopfield (LBH) emissions are an important signature of excited N2 in the upper atmosphere of Earth and have been clearly identified in Cassini’s Ultraviolet Imaging Spectrograph (UVIS) measurements of Titan’s airglow. Hence, the LBH band of emissions, produced primarily from electron impact-induced excitation of the metastable a1Πg state followed by decay into the ground state, is an essential input for models of auroral processes in nitrogen-rich atmospheres. In spite of this, there are still many gaps in the existing laboratory dataset. For instance, the total LBH cross section calculated in [Ajello and Shemansky, JGR, 90, 9845, 1985] was based soley on a single LBH line, a(3,0). In this paper, we present updated excitation cross sections for both the a(3,0) and a(2,0) vibronic transitions and provide revised total cross sections. These new measurements are found to be consistent with recent electron energy-loss measurements. In addition, new electron energy-loss measurements are presented for excitation of the a1Πg state, with finely-spaced (<0.1eV) impact energy increments in the threshold-to-above-peak region. These measurements are unique in that they occur at fixed electron scattering angles, differential in impact energy. New, near-threshold integral cross sections are provided. Acknowledgments: This work was carried out at JPL, Caltech, and at CSU Fullerton under contract with NASA and with funding from NSF-RUI.
Ajdari B.
Johnson Paul V.
Kanik Inanc
Khakoo M. A.
Liu Xiandong
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