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NH2 fluorescence efficiencies and the NH3 abundance in Comet Halley

Tegler, Stephen and Wyckoff, Susan (1989) NH2 fluorescence efficiencies and the NH3 abundance in Comet Halley. The Astrophysical Journal, 343. pp. 445-449. ISSN 1538-4357


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Publisher’s or external URL: http://dx.doi.org/10.1086/167717


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).

Item Type: Article
Publisher’s Statement: © 1989 The American Astronomical Society. Published in the Astrophysical Journal.
ID number or DOI: 10.1086/167717
Keywords: Comet, Halley, Fluorescence, Ammonia, Abundance, NH2 Radical, Models, Parent Molecules, Production Rates
Subjects: Q Science > QB Astronomy
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: College of Engineering, Forestry, and Natural Science > Physics and Astronomy
Date Deposited: 19 Jan 2016 17:19
URI: http://openknowledge.nau.edu/id/eprint/1853

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