Molecular hydrogen formation on interstellar dust grains

Details Molecular hydrogen formation on interstellar dust grains Molecular hydrogen formation on interstellar dust grains

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.261..215c&link_type=abstract

Nature, vol. 261, May 20, 1976, p. 215, 216. ERDA-supported research.

Physics

4

Cosmic Dust, Desorption, Gas-Solid Interfaces, Hydrogen, Interstellar Matter, Adsorption, Carbon Monoxide, Graphite, Silicon Dioxide, Substrates, Water

Scientific paper

A dynamical theory of phonon-induced desorption is presented. It is shown that when the binding energy of the adsorbed atoms exceeds the Debye temperature of the substrate, the characteristic desorption time at low temperatures is low. This provides a new estimate of 30 K for the maximum temperature of efficient H2 formation, consistent with the observed abundance of H2 in interstellar dust clouds. It is concluded from the model that the basal planes of clean graphite flakes are not suitable substrates for H2 formation, whereas solid CO, H2O, and SiO2 surfaces are.

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