Interpretation of the ion mass spectra in the mass range 25-35 obtained in the inner coma of Halley's comet by the HIS-sensor of the Giotto IMS Experiment

Details Interpretation of the ion mass spectra in the mass range 25-35 obtained in the inner coma of Halley's comet by the HIS-sensor of the Giotto IMS Experiment Interpretation of the ion mass spectra in the mass range 25-35 obtained in the inner coma of Halley's comet by the HIS-sensor of the Giotto IMS Experiment

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sicd.reptr....g&link_type=abstract

In LMSC, A Study of Ion Composition and Dynamics at Comet Halley 34 p (SEE N93-13465 03-90)

Computer Science

Affinity, Calibrating, Giotto Mission, Halley'S Comet, Ion Density (Concentration), Mass Spectra, Mass Spectrometers, Protons, Formaldehyde, Hydrocarbons, Hydrocyanic Acid, Hydrogen Sulfide, Methyl Alcohol

Scientific paper

The IMS-HIS double-focussing mass spectrometer that flew on the Giotto spacecraft covered the mass per charge range from 12 to 56 (AMU/e). By comparing flight data, calibration data, and results of model calculations of the ion population in the inner coma, the absolute mass scale is established, and ions in the mass range 25 to 35 are identified. Ions resulting from protonation of molecules with high proton affinity are relatively abundant, enabling us to estimate relative source strengths for H2CO, CH3OH, HCN, and H2S, providing for the first time a positive in situ measurement of methanol. Also, upper limits for NO and some hydrocarbons are derived.

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