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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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).
| 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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