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Formation of molecular hydrogen on amorphous silicate surfaces

Authors
  • Joe Roser
  • Swords, Sol
  • Perets, Hagai B.
  • Lederhendler, Adina
  • Biham, Ofer
  • Brucato, John Robert
  • Pirronello, Valerio
  • Vidali, Gianfranco
  • Li, Ling
  • Manico, Giulio
  • Congiu, Emanuele
Type
Preprint
Publication Date
Sep 15, 2007
Submission Date
Sep 15, 2007
Identifiers
arXiv ID: 0709.2472
Source
SETI Institute
License
Unknown
External links

Abstract

Experimental results on the formation of molecular hydrogen on amorphous silicate surfaces are presented and analyzed using a rate equation model. The energy barriers for the relevant diffusion and desorption processes are obtained. They turn out to be significantly higher than those obtained for polycrystalline silicates, demonstrating the importance of grain morphology. Using these barriers we evaluate the efficiency of molecular hydrogen formation on amorphous silicate grains under interstellar conditions. It is found that unlike polycrystalline silicates, amorphous silicate grains are efficient catalysts of H_2 formation in diffuse interstellar clouds.

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