Speculations about the origin of H3O(+) seen in cometary mass spectra

Details Speculations about the origin of H3O(+) seen in cometary mass spectra Speculations about the origin of H3O(+) seen in cometary mass spectra

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.326..366m&link_type=abstract

Nature (ISSN 0028-0836), vol. 326, March 26, 1987, p. 366, 367. SNSF-USAF-supported research.

Physics

16

Cometary Atmospheres, Cosmochemistry, Mass Spectra, Molecular Ions, Photoionization, Water, Dimers, Giacobini-Zinner Comet, Halley'S Comet

Scientific paper

The evaporation of water from a cometary nucleus and dust is considered, and the effects of water dimer on the expected ionic species are evaluated. A reaction network and a very simple model of a rapidly outgassing body at a moderate temperature in the unattenuated photon flux from the sun at 1 AU are used to calculate radial profiles of concentrations of H2O(+), H3O(+), (H2O)2(+), and (H5O2)(+). From the results, it is suggested that some of the H3O(+) ions detected in large amounts in the comas of the comets Halley and Giacobini-Zinner arise from the photoionization of water dimer formed by direct vaporization of ice, from solid surfaces at the cometary nucleus or from ice particles ejected in cometary jets.

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