Crossed Molecular Beam Studies of the Reactions of Oxygen and Fluorine Atoms

摘要

This annual report describes the primary photodissociation of acetylene (C2H2) and bromoiodomethane (CH2BrI) using a new molecular beam photofragmentation translational spectrometer. The new third generation molecular beam photofragmentation translational spectrometer constructed during the past year is described in detail. This apparatus incorporates many new ideas and allows us to study some of the primary dissociation processes of polyatomic molecules which were not possible in the past. The dissociation of Ch2BrI at 248 and 193 nm is extremely interesting. The competition between C-I and CC-Br bond rupture is the key question, but dissociations at 193 nm also produces IBr products. Secondary photodissociations of primary products were also found to be important. These two systems are carried out partly for the purpose of evaluating the performance of the new molecular beam photofragmentation apparatus. The results clearly show that the performance of the apparatus is as good as our original expectation and that it should be capable of handling molecules with very low vapor pressures; studies of these molecules, such as the nitroamines, are planned. (Author)