Physics
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84..839e&link_type=abstract
Journal of Geophysical Research, vol. 84, Mar. 1, 1979, p. 839-844.
Physics
3
Chemical Reactions, Gas-Solid Interfaces, Ion Sources, Mass Spectroscopy, Nitrogen Atoms, Upper Atmosphere, Electron Bombardment, Explorer 17 Satellite, Ion Density (Concentration), Nitrogen Oxides, Surface Properties, Temperature Distribution
Scientific paper
The paper presents a simplified model of the ion source chemistry, explains several details of the data reduction method used in obtaining atomic-nitrogen (N) densities from OSS data, and discusses implications of gas-surface reactions for the design of future satellite-borne mass spectrometers. Because of various surface reactions, N appears in three different forms in the ion source, as N, NO, and NO2. Considering the rather small spin modulation of NO and NO2 in the semi-open ionization chamber used in the OSS instrument, it is not surprising that these reaction products have not been previously identified in closed source instruments as a measure of the presence of atomic nitrogen. Warmup and/or outgassing of the ion source are shown to drastically reduce the NO2 concentration, thereby making possible reliable measurement of ambient N densities.
Engebretson Mark J.
Mauersberger Konrad
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