Other
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986qjras..27...71h&link_type=abstract
Royal Astronomical Society, Quarterly Journal (ISSN 0035-8738), vol. 27, March 1986, p. 71-82.
Other
4
Gas Temperature, Hydrogen Clouds, Interstellar Chemistry, Magnetohydrodynamic Flow, Molecular Clouds, Reaction Kinetics, Chemical Composition, Endothermic Reactions, Shock Waves, Stellar Winds, T Tauri Stars
Scientific paper
Dissipation in flows often heats molecular gas to temperatures at which many reactions that are endothermic or that have activation barriers can proceed. H2 observations have been used to diagnose the conditions in flows in molecular clouds, but theoretical studies of the H2 level population problem are very incomplete. Much of the H2 emission and many of the chemical species formed arise in the precursor regions of MHD shocks; several quite general differences between the chemistries in precursor zones and in high T regions behind ordinary hydrodynamic shocks exist. The abundance of CH(+) in MHD shocks in diffuse molecular clouds should exceed that in ordinary hydrodynamic shocks but shock formation models for the observed CH(+) abundances face several difficulties. In dense clouds shocks in T-Tauri wind blown bubbles may play important roles in establishing the observed chemical compositions in 'apparently quiescent' regions.
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