Molecular hydrogen formation on ice under interstellar conditions

Hagai B. Perets, Ofer Biham, Giulio Manicó, Valerio Pirronello, Joe Roser, Sol Swords, Gianfranco Vidali

Research output: Contribution to journalArticle

80 Scopus citations

Abstract

The results of experiments on the formation of molecular hydrogen on low-density and high-density amorphous ice surfaces are analyzed using a rate equation model. The activation energy barriers for the relevant diffusion and desorption processes are obtained. The more porous morphology of the low-density ice gives rise to a broader spectrum of energy barriers compared to the high-density ice. Inserting these parameters into the rate equation model under steady-state conditions, we evaluate the production rate of molecular hydrogen on ice-coated interstellar dust grains.

Original languageEnglish (US)
Pages (from-to)850-860
Number of pages11
JournalAstrophysical Journal
Volume627
Issue number2 I
DOIs
StatePublished - Jul 10 2005

Keywords

  • Astrochemistry
  • Dust, extinction
  • ISM: abundances
  • ISM: molecules
  • Molecular processes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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