Other
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235..621p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Dec. 1, 1988, p. 621-631. Research supported by SE
Other
30
Aromatic Compounds, Cyclic Hydrocarbons, Dark Matter, Interstellar Chemistry, Molecular Clouds, Shock Waves, Ambipolar Diffusion, Chemical Composition, Interstellar Matter, Shock Wave Propagation
Scientific paper
The effects of polycyclic aromatic hydrocarbon (PAH) molecules on the physical chemistry in dark clouds is investigated. It is found that the PAH molecules significantly influence the structure of MHD shocks propagating in dark clouds by changing both the equilibrium state of the preshock gas and the chemistry within the shock. Electron detachment reactions involving PAH-ions and neutral species such as O atoms can be driven by ambipolar diffusion in the shock, providing that their endothermicities are not too high. Should the endothermicities of these reactions be sufficiently small to permit them to proceed rapidly in a cold medium, the overall degree of ionization of the preshock gas is lowered, which has important consequences for the shock structure.
Dalgarno Alexander
Flower David R.
Pineau des Forêts Guillaume
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