Fourth Positive Group (4PG) band system; MAVEN IUVS; cross section; 1356; airglow; Mars; Venus; dissociation
Abstract :
[en] We have measured the 30 and 100 eV far ultraviolet (FUV) emission cross sections of the optically allowed Fourth Positive Group (4PG) band system (A 1 Π → X 1 Σ + ) of CO and the optically forbidden O (5S → 3P) 135.6 nm atomic transition by electron-impact-induced-fluorescence of CO and CO2 . We present a model excitation cross section from threshold to high energy for the A 1Π state, including cascade by electron impact on CO. The A 1Π state is perturbed by triplet states leading to an extended FUV glow from electron excitation of CO. We derive a model FUV spectrum of the 4PG band system from dissociative excitation of CO2 , an important process observed on Mars and Venus. Our unique experimental setup consists of a large vacuum chamber housing an electron gun system and the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission Imaging Ultraviolet Spectrograph optical engineering unit, operating in the FUV (110–170 nm). The determination of the total OI ( 5S o ) at 135.6 nm emission cross section is accomplished by measuring the cylindrical glow pattern of the metastable emission from electron impact by imaging the glow intensity about the electron beam from nominally zero to ~400 mm distance from the electron beam. The study of the glow pattern of O i (135.6 nm) from dissociative excitation of CO and CO 2 indicates that the OI (5 S) state has a kinetic energy of ~1 eV by modeling the radial glow pattern with the published lifetime of 180 μs for the OI (5 S) stat.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Ajello, J. M.; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States
Malone, C. P.; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Evans, J. S.; Computational Physics Inc., Springfield, VA, United States
Holsclaw, G. M.; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States
Hoskins, A. C.; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States
Jain, S. K.; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States
McClintock, W. E.; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States
Liu, X.; Planetary and Space Science Division, Space Environment Technology, Pacific Palisades, CA, United States
Veibell, V.; Computational Physics Inc., Springfield, VA, United States
Deighan, J.; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Lo, D. Y.; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States
Schneider, N.; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States
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