Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3061..259f&link_type=abstract
In NASA, Ames Research Center, Carbon in the Galaxy: Studies from Earth and Space p 259-273 (SEE N90-27562 21-88)
Physics
4
Carbon, Chemical Reactions, Cyclic Hydrocarbons, Diamonds, Flames, Graphite, Interstellar Matter, Reaction Kinetics, Soot, Vapor Deposition, Vapor Phases, Acetylene, High Temperature, Hydrogen Atoms, Images, Radicals
Scientific paper
A variety of seemingly different carbon formation processes -- polycyclic aromatic hydrocarbons and diamond in the interstellar medium, soot in hydrocarbon flames, graphite and diamond in plasma-assisted-chemical vapor deposition reactors -- may all have closely related underlying chemical reaction mechanisms. Two distinct mechanisms for gas-phase carbon growth are discussed. At high temperatures it proceeds via the formation of carbon clusters. At lower temperatures it follows a polymerization-type kinetic sequence of chemical reactions of acetylene addition to a radical, and reactivation of the resultant species through H-abstraction by a hydrogen atom.
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