New gas-grain chemical models of quiescent dense interstellar clouds - The effects of H2 tunnelling reactions and cosmic ray induced desorption

Details New gas-grain chemical models of quiescent dense interstellar clouds - The effects of H2 tunnelling reactions and cosmic ray induced desorption New gas-grain chemical models of quiescent dense interstellar clouds - The effects of H2 tunnelling reactions and cosmic ray induced desorption

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.261...83h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 261, no. 1, p. 83-102.

Other

205

Astronomical Models, Cosmic Rays, Exothermic Reactions, Hydrogen, Interstellar Chemistry, Interstellar Extinction, Molecular Clouds, Surface Reactions, Activation Energy, Gas Density, Gas Temperature, Organic Compounds, Tables (Data)

Scientific paper

New models of the dense interstellar clouds chemistry in which both gas-phase and grain-surface chemistry occur are presented. The chemistry in quiescent clouds is described at the dust-grain and gas temperatures of 10 K and the gas density of 2 x 10 exp 4/cu cm. It is found that the synthesis of complex molecules on 10-K grain surfaces does not proceed even for models that are in atomic H and rich in H2, the activation energy of reactions of hydrocarbon radicals C(n) and C(n)H with H2 is 2100 K. Such a low activation energy allow tunnelling to take place and produce more saturated, less reactive molecular species. It is also found that cosmic ray desorption processes cannot prevent the bulk of the heavy gaseous material from accreting on to dust particles in sufficiently long times if the overall gas density is 2 x 10 exp 4/cu cm.

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