Molecular hydrogen formation on ice under interstellar conditions

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

89 Scopus citations


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 languageAmerican English
Pages (from-to)850-860
Number of pages11
JournalAstrophysical Journal
Issue number2 I
StatePublished - 10 Jul 2005


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


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