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- W2079419062 abstract "view Abstract Citations (48) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS NH 2 Fluorescence Efficiencies and the NH 3 Abundance in Comet Halley Tegler, S. ; Wyckoff, S. Abstract 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). Publication: The Astrophysical Journal Pub Date: August 1989 DOI: 10.1086/167717 Bibcode: 1989ApJ...343..445T Keywords: 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; Astrophysics; Comets; ABUNDANCES; COMETS; MOLECULAR PROCESSES; TRANSITION PROBABILITIES full text sources ADS |" @default.
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- W2079419062 date "1989-08-01" @default.
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- W2079419062 title "NH2 fluorescence efficiencies and the NH3 abundance in Comet Halley" @default.
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