Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..445t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 1, 1989, p. 445-449.
Astronomy and Astrophysics
Astrophysics
41
Abundance, Ammonia, Astronomical Spectroscopy, Fluorescence, Halley'S Comet, Electron Transitions, Irradiance, Molecular Spectra, Photodissociation, Water, Comets, Halley, Fluorescence, Ammonia, Abundance, Nh2 Radical, Models, Parent Molecules, Production Rates, Calculations, Comparisons
Scientific paper
If NH3 is the dominant source of the NH2 observed in comet spectra, then the NH3 abundance can in principle be accurately determined. Fluorescence efficiencies for the (0, v-prime/2/, O) to (0, 0, 0) progression of NH2 bands are calculated for NH2 bands likely to be observed in the 4500-8200-A region of comets. The results differ from previous determinations of the NH2 band fluorescence efficiencies by factors in the range 1.4-5.9, leading t6o significant changes in previously reported NH2 production rates in comets. A recalculation of the NH3/H2O abundance ratio in Comet Halley gives about (0.5 + or - 0.2) percent in better agreement with the Giotto ion-mass-spectrometer results of Allen et al (1987).
Tegler Stephen
Wyckoff Susan
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