| The chemiluminescent emission from silicon and germanium monosulfide resulting from the reaction of silicon and germanium metal with carbonyl sulfide has been studied under both single and multiple collision conditions. Included in this study is the observation of the SiS and GeS a('3)(SIGMA)('+) - X('1)(SIGMA)('+) and SiS b('3)(PI) - X('1)(SIGMA)('+) band systems. The temperature dependence of the observed single collision spectra is analyzed to deduce the nature of the metal reactant beams and to determine the activation energies for formation of SiS* (a('3)(SIGMA)('+), b('3)(PI)) and GeS* (a('3)(SIGMA)('+)). Lower bounds of 144.1 (+OR-) 1.6 kcal/mole and 132.2 (+OR-) 1.0 Kcal/mole are determined for.;(DIAGRAM, TABLE OR GRAPHIC OMITTED...PLEASE SEE DAI).;respectively. Multiple collision spectral studies are used to initiate the exploration of collisional quenching.;An intense source has been developed to study the reactions of boron atoms with O(,2), NO(,2), N(,2)O, ClO(,2), and O(,3). The chemiluminescent emissions which characterize the bimolecular reaction of boron with O(,2), N(,2)O, ClO(,2), and O(,3) are dominated by the A('2)(PI) - X('2)(SIGMA)('+) band system of BO. In contrast, the chemiluminescence from the bimolecular boron-NO(,2) reaction is dominated by strong BO(,2) A('2)(PI)(,u) - X('2)(SIGMA)(,g) emission. A reaction mechanism consistent with these observations is proposed.;A supersonic expansion of pure sodium vapor has been used to form small sodium clusters M(,n), n (GREATERTHEQ) 2. Discussion focuses on the characterization of such an expansion carried out for a wide range of experimental conditions and the analysis of laser induced atomic fluorescence (LIAF) resulting from the photodissociation of triatomic sodium clusters. Considered are: (1) the nature of observed "fluctuation" bands corresponding to the pumping of bound-free transitions in Na(,3) which yield ('2)P Na atoms (Na D-line emission) and ground state.;(DIAGRAM, TABLE OR GRAPHIC OMITTED...PLEASE SEE DAI).;(2) the possibility of controlled "hot band" formation through disruption of the expansion, allowing the mapping of vibronic structure in the ground electronic and low-lying electronic states of Na(,3); (3) the determination of an upper bound D(,0) (LESSTHEQ) 4250 cm('-1) for the Na-Na(,2) bond energy; and (4) the observation of very efficient energy transfer between Na(,2) and polyatomic sodium.;A continuous, high-temperature seeded supersonic molecular beam source has been developed and demonstrated. This supersonic expansion of an antimony vapor/argon carrier gas mixture is used to obtain "cooled" antimony dimer optical spectra via laser induced fluorescence corresponding to the.;(DIAGRAM, TABLE OR GRAPHIC OMITTED...PLEASE SEE DAI).;band system. |
