Emission cross section of OI (135.6 nm) at 100 eV resulting from electron-impact dissociative excitation of O2.

Details Emission cross section of OI (135.6 nm) at 100 eV resulting from electron-impact dissociative excitation of O2. Emission cross section of OI (135.6 nm) at 100 eV resulting from electron-impact dissociative excitation of O2.

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1379n&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 7, p. 1379-1382

Physics

Space Physics

8

Atmospheric Composition And Structure: Planetary Atmospheres, Planetology: Solid Surface Planets: Atmospheres-Composition And Chemistry, Planetology: Solid Surface Planets: Atmospheres-Evolution, Planetology: Solid Surface Planets: Atmospheres-Structure And Dynamics

Scientific paper

In this Letter, we report for the first time, the ratio of the O I (135.6 nm)/O I (130.4 nm) absolute emission cross sections from electron-impact dissociative excitation of O2 at 100 eV using facilities located at the University of Colorado, Laboratory for Atmospheric and Space Physics (LASP). The O I (135.6 nm) emission glow produced in the laboratory from the long-lived transition OIg3P<-5S0 was measured in a large collision chamber (1 m diameter) with a long focal length (50 cm) electrostatic electron gun. The ratio of the absolute emission cross sections of the O I (135.6 nm) and O I (130.4 nm) features resulting from electron-impact dissociative excitation of O2 at 100 eV was found to be 2.3+/-0.6. From this ratio, the absolute emission cross section for the O I (135.6 nm) feature at 100 eV electron-impact energy was determined to be (6.4+/-2.2)×10-18cm2. The O I (135.6 nm) cross section reported here can be used to better understand the recent Hubble Space Telescope observations of the O I (130.4 nm) and O I (135.6 nm) emission intensities from Ganymede [Feldman et al., 2000] and Europa [Hall et al., 1995].

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