Elementary Processes in Combustion and Sooting of Coal Derived Fuels. Progress Report: 1st Year, 3rd Quarter, February 10-May 9, 1983

摘要

Progress on three projects is briefly presented. (1) Reactivity of Phenyl Radicals - As reported last quarter, we have been considering uv multiphoton ionization spectroscopy (MPI) as a technique for probing the reactivity of phenyl radicals. We have successfully examined the MPI of chloro- and bromobenzene, our precursors to the phenyl species. Once the interferences of the parent are known, the selective detection (excitation and ionization) of the radical will be pursued. Separate studies of the reactions of phenyl radicals with molecular oxygen have been examined. Using a low pressure gas cell, the ir multiphoton dissociation of chlorobenzene leads to the production of the radical species. In the presence of molecular oxygen the decomposition is enhanced and the appearance of CO, ethylene and acetylene has been monitored. (2) Diradicals - Our studies of the chemistry of the C sub 4 H sub 8 diradical continue and we have recently examined the chemical trapping of this species. The presence of ethylene or oxygen in the reaction mixture did not lead to new products and this suggests that the diradical is short-lived, possibly a short-lived triplet state. (3) Free jet probing of combustion intermediates - We are continuing our efforts to develop an approach for isolation and probing of reaction intermediates. (ERA citation 10:019853)