The EUV spectrum of H2O by electron impact

Details The EUV spectrum of H2O by electron impact The EUV spectrum of H2O by electron impact

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11.1195a&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, Dec. 1984, p. 1195-1198. NASA-USAF-supported research.

Physics

7

Electron Impact, Extreme Ultraviolet Radiation, Molecular Spectra, Ultraviolet Spectra, Water, Atmospheric Moisture, Dissociation, Fluorescence, Lyman Alpha Radiation, Solar System

Scientific paper

The vacuum ultraviolet (VUV) spectrum of H2O produced by electron impact at 200 eV is presented. A total of 25 spectral features are identified at a resolution of 0.5 nm over the wavelength range from 40 to 280 nm. Absolute emission cross-sections were obtained for each of the features. The differences of the features are all attributed to the various excited states of the dissociation products, H, O and O(+). The Lyman-alpha feature is the brightest for electron-induced fluorescence of H2O from the UV to the near-IR, and had a cross-section of 6.3 (+ or - 1.0 x 10 to the -18th) sq cm at 200 eV. The Lyman-alpha feature contributed 74 percent of the total measured emission cross-section in the EUV.

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