Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa31a1598m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA31A-1598
Physics
0310 Airglow And Aurora, 0343 Planetary Atmospheres (5210, 5405, 5704), 6221 Europa, 6222 Ganymede
Scientific paper
Electron impact on molecular oxygen has been discussed by McConkey et al. [doi:10.1026/j.physrep.2008.05.001] in their recent review of dissociation processes in oxygen containing molecules. On Europa and Ganymede, oxygen emissions have been shown to be primarily due to dissociative electron impact excitation of O2. Though the majority of the 83.4 nm emission from Earth's airglow in the lower ionosphere originates from solar EUV photoionization-excitation of atomic oxygen, with some from electron impact, complete analysis of auroral emissions (at lower altitudes) should involve some e- + O2 contribution. The magnitudes of the previous O II (83.4 nm) emission cross sections resulting from e- +O2 were in poor agreement with a factor of about 5 between the largest and smallest values at 200 eV. This significant disparity in cross sections prompted the present investigation. In summary, very good overlap was demonstrated between the present O II (83.4 nm) absolute emission cross section data with those of Ajello and Franklin [1985] and Zipf et al. [1985]. Thus both the shape and the magnitude of the emission cross section can be considered as well-established in the lower-energy region below approximately 300 eV.
Acknowledgement: This work was carried out at JPL, Caltech, under contract with NASA with support from the NASA PATM program.
Johnson Paul V.
Kanik Inanc
Malone Charles P.
McConkey J.
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