Other
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..163h&link_type=abstract
In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 163-167 (SEE N88-21884 14-91)
Other
2
Formaldehyde, Giotto Mission, Halley'S Comet, Mass Spectrometers, Methylene, Polymer Chemistry, Chemical Composition, Cosmic Rays, Radiation Effects
Scientific paper
The RPA2-Positive Ion Cluster Composition Analyzer (PICCA) on the Giotto spacecraft detected 5 mass peaks with regular spacing of 15 amu up to approximately 120 amu. Starting at 45 amu, the peaks decrease in intensity with increasing mass. Within their half-width they are in good agreement with dissociation products of formaldehyde polymer (POM). A production sequence in which cosmic radiation formed POM from water and carbon monoxide on grains that were aggregated into cometesimals is suggested. Other polymers, possibly containing CN, may also exist. Observations suggest that at least some of the H-, C-, and O-containing dust particles detected by the Particle Impact Analyzer (PIA) on board the Giotto spacecraft and its equivalent on the VEGA-1 and -2 spacecraft contain POM. The properties of POM are consistent with many of the unexpected observations in the coma.
Boice Daniel C.
Huebner Walter F.
Korth Alex
Lin Robert P.
Mitchell David Leroy
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