The origin of complex organic ions in the coma of Comet Halley

Details The origin of complex organic ions in the coma of Comet Halley The origin of complex organic ions in the coma of Comet Halley

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992icar...98..125m&link_type=abstract

Icarus (ISSN 0019-1035), vol. 98, no. 1, July 1992, p. 125-133. Research supported by Max-Planck-Gesellschaft zur Foerderung der

Computer Science

23

Cometary Atmospheres, Halley'S Comet, Molecular Ions, Organic Compounds, Coma, Giotto Mission, Mass Spectra, Solar System Evolution

Scientific paper

The Giotto-PICCA instrument has obtained heavy-ion mass spectra in the inner coma of Comet Halley; the spectra exhibit a series of distinct mass groups separated by a constant about 15 amu, and extending to at least 120 amu, whose pattern is typical of CHON molecules. It is found that neither coma gas-phase chemistry nor UV photon, solar wind particle, or cosmic irradiation of the nucleus in its current orbit can generate enough heavy molecules to account for the PICCA abundances. It is suggested that these abundances may be supplied by UV and cosmic irradiation of the icy, precometary grains within interstellar molecular clouds and/or the protosolar nebula.

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