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

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



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

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Perets, H. B., Biham, O., Manicó, G., Pirronello, V., Roser, J., Swords, S., & Vidali, G. (2005). Molecular hydrogen formation on ice under interstellar conditions. Astrophysical Journal, 627(2 I), 850-860.