SIMBAD references

2014MNRAS.440.3557R - Mon. Not. R. Astron. Soc., 440, 3557-3567 (2014/June-1)

Grain-surface reactions in molecular clouds: the effect of cosmic rays and quantum tunnelling.


Abstract (from CDS):

Grain-surface reactions play an essential role in interstellar chemistry, since dust grain catalyzes 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 tunnelling 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 tunnelling 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.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): astrochemistry - diffusion - ISM: clouds - cosmic rays - ISM: molecules

Simbad objects: 6

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