Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa33a0256k&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA33A-0256
Physics
2400 Ionosphere (6929), 7549 Ultraviolet Emissions, 9800 General Or Miscellaneous
Scientific paper
Emissions in the VUV have been probed for transitions from various excited electronic states (e.g., N^{\ast} (3s 4P)) resulting from electron impact of various atmospheric gases, including nitrous oxide (N2O). The experimental setup consists of a 0.2m spectrometer and an electron collision chamber. The electron beam (with energy spread of ~0.5eV) was magnetically collimated with an axially symmetric magnetic field and accelerated to a given kinetic energy. A Faraday cup was used to monitor the beam current and to minimize the back-scattered electrons. Photons emitted by electron impact excited target molecules and excited atoms following dissociative excitation, were dispersed by the spectrometer and detected with a channel electron multiplier coated with CsI. Measured emission spectra and emission cross sections as functions of incident energy will be presented.
Acknowledgement: This work was carried out at JPL, Caltech, under contracts with NASA and NSF. This research was performed while CPM and JWMcC held NASA Fellowships at JPL.
Ajello Joseph M.
Johnson Paul V.
Kanik Inanc
Malone Charles P.
McConkey John W.
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