Fabry-Perot observations of NH2 emission from Comet Halley

Details Fabry-Perot observations of NH2 emission from Comet Halley Fabry-Perot observations of NH2 emission from Comet Halley

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...82...50m&link_type=abstract

Icarus (ISSN 0019-1035), vol. 82, Nov. 1989, p. 50-60. Research supported by the University of Wisconsin and National Solar Obse

Physics

18

Emission Spectra, Free Radicals, Halley'S Comet, Molecular Spectra, Abundance, Ammonia, Chemical Reactions, Visible Spectrum, Water

Scientific paper

The (0,8,0) cometary NH2 band lines have been isolated from both cometary and terrestrial OI 6300 A OH emissions in Fabry-Perot spectra of the emissions of Comet Halley near 6300 A. On the assumption that the major source of NH2 is NH3, these NH2 measurements limit NH3's abundance relative to H2O. The results thus obtained are noted to depend on the NH2 (0,8,0) band fluorescence efficiency factor g(B); using the g(B) value of A'Hearn (1982), the NH3 abundance is found to be about 0.1 percent of that of H2O, while the g(B) value of Tegler and Wyckoff (1989) yields a figure of 0.4 percent. Both results indicate a low NH3 abundance relative to water on Comet Halley.

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