Physics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.303..513d&link_type=abstract
(Royal Society, Discussion on Molecules in Interstellar Space, London, England, May 20, 21, 1981.) Royal Society (London), Philo
Physics
7
Interstellar Chemistry, Interstellar Gas, Molecular Gases, Shock Waves, Chemical Reactions, Dissociation, Electron Impact, Molecular Collisions
Scientific paper
Shocks are a ubiquitous phenomenon in interstellar space. Ultraviolet photons emitted by a star ionize the gas around it, raise the pressure, and drive a shock into the medium. Stronger shocks are produced by stellar winds from early type stars, by collisions of interstellar clouds, and by supernova explosions. A diverse array of physical and chemical processes occurs in shocked gases. Molecular dissociation processes are crucial to the analysis of shocks propagating in clouds with densities exceeding about 100 per cu cm. Collision-induced dissociation is considered along with electron impact dissociation, chemical reactions, and photodissociation. Formation processes are discussed, taking into account grain catalysis and chemical reactions. An investigation is conducted concerning the molecular composition in three regions where shock may be propagating, giving attention to the Kleinman-Low nebula, the IC 443, and Ophiuchi.
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