Radiation synthesis of carbon dioxide in ice-coated carbon: Implications for interstellar grains and icy moons

U. Raut, D. Fulvio, M. J. Loeffler, R. A. Baragiola

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

We report the synthesis of carbon dioxide on an amorphous carbon-13 substrate coated with amorphous water ice from irradiation with 100keV protons at 20K and 120K. The quantitative studies show that the CO2 is dispersed in the ice; its column density increases with ion fluence to a maximum value (in 1015 moleculescm-2) of 1 at 20K and 3 at 120K. The initial yield is 0.05 (0.1) CO2 per incident H+ at 20 (120)K. The CO2 destruction process, which limits the maximum column density, occurs with an effective cross section of 2.5 (4.1) × 10 -17cm2 at 20 (120)K. We discuss radiation-induced oxidation by reactions of radicals in water with the carbon surface and demonstrate that these reactions can be a significant source of condensed carbon dioxide in interstellar grains and in icy satellites in the outer solar system.

Original languageEnglish (US)
Article number159
JournalAstrophysical Journal
Volume752
Issue number2
DOIs
StatePublished - Jun 20 2012
Externally publishedYes

Keywords

  • astrochemistry
  • ISM: abundances
  • ISM: molecules
  • methods: laboratory
  • planets and satellites: composition
  • planets and satellites: surfaces

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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