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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2014

Grain Surface Reactions in Molecular Clouds: The Effect of Cosmic Rays and Quantum Tunneling

Laura Reboussin
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Valentine Wakelam
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S. Guilloteau
F. Hersant
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  • PersonId : 853119

Résumé

Grain-surface reactions play an essential role in interstellar chemistry, since dust grain catalyses reactions at its surface allowing for the formation of molecules. We used a chemical model in which both gas-phase and grain-surface reactions occur and studied particularly the diffusion mechanisms on the surface of the grains. Surface reactions can occur via thermal hopping when species cross over a potential barrier or via quantum tunneling when species cross through this barrier. We show that the thermal diffusion (hopping) can be much more efficient after a cosmic ray particle collides with a dust grain, heating it to a peak temperature of 70K. We present here the results of numerical simulations after including the quantum tunneling mechanism for species H, H2 and O and considering the effect of cosmic ray particle collision on the surface reactions. As a consequence, the gas-phase and grain-surface abundances are affected and we show that more complex molecules can be formed in molecular clouds.

Dates et versions

hal-00964074 , version 1 (24-03-2014)

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Citer

Laura Reboussin, Valentine Wakelam, S. Guilloteau, F. Hersant. Grain Surface Reactions in Molecular Clouds: The Effect of Cosmic Rays and Quantum Tunneling. Monthly Notices of the Royal Astronomical Society, 2014, 440 (4), pp.3557-3567. ⟨10.1093/mnras/stu462⟩. ⟨hal-00964074⟩

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