Formation of molecular hydrogen on amorphous silicate surfaces

Details Formation of molecular hydrogen on amorphous silicate surfaces Formation of molecular hydrogen on amorphous silicate surfaces

2007-09-16

arxiv.org/abs/0709.2472v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figs. Proceedings of the international astrophysics and astrochemistry meeting in Paris (2007): Molecules in space

Scientific paper

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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