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Photoelectron-imaging spectroscopy, flowing afterglow-photoelectron spectroscopy and the flowing afterglow-selected ion flow tube technique and electronic structure calculations are used for studying the mechanism of the reaction of the hydroxide ion (H[O.sup.-]) with 1H-1,2,3-triazole. Deprotonation of 1H-1,2,3-triazole at the C5 position has initiated fragmentation of the ring structure to yield a minor product, the ketenimine anion.

The reactions of hydrated electron with various radicals are studied in pulse radiolysis experiments. The rate constants of hydrated electron reactions with various reactive radicals are measured over a temperature range of 5-75 degree C, which helps in understanding the hydrated electron radical reaction rates.

The photosensitive Belousov-Zhabotinsky (BZ) reaction was studied on a circular ring that was drawn using computer software and then projected on a film soaked with BZ solution. It was observed that a chemical wave propagated with a constant velocity on the black ring under a bright background under initial conditions and when the background was rapidly changed to dark, coexistence of the oscillation on part of the ring and propagation of the chemical wave on the other part was observed.

The electron affinity (EA), photoelectron spectrum and the spectral analysis of 1-pyrazolide are presented. The thermodynamic properties of the pyrazole system, as well as the electronic structure of the corresponding radicals are discussed.

The photoelectron spectra of AuO(super -) and an isovalent system, AuS(super -) are reported. The results are discussed in relation to the other coinage metal oxides, CuO and AgO and a comparison between gold and other coinage metal oxides reveals the strong relativistic effects in the gold system.

The photosensitive Belousov-Zhabotinsky (BZ) reaction with Ru(bpy)(sub 3)(super 2+) catalyst is used to examine wave propagation and annihilation at the boundaries of excitable and inhibitory regions of an active medium. A boundary layer is formed because of molecular diffusion, where the concentrations of the species are different from those far from the boundary.

Research into spacer dependence of intersystem crossing rates of the free base porphyrin moiety in gable-type copper(II)-free base porphyrin heterodimers involving a new dimer with a phenanthrene bridge is presented. The through-bond interaction is likely to be dominant in controlling the intersystem crossing rate.

The 351.1 nm photoelectron spectra of the N-methyl-5-pyrazolide anion and the N-methyl-5-imidazolide anion are reported. The excellent agreement is found with the calculated FC factors for the N-methyl-5-pyrazolyl radical.

The 351.1nm photoelectron spectrum of imidazolide anion is measured. The thermodynamic parameters for imidazole and imidazolyl radical are compared with those for pyrrole and pyrrolyl radical and the effects of the additional N atom in the five-membered ring are discussed.

An excitable field in the shape of a circular ring or figure '8' that was drawn by the computer software and then projected on a film soaked with Belousov-Zhabotinsky (BZ) solution using a liquid-crystal projector is used to investigate the propagation of chemical waves in the photosensitive BZ reaction. The results suggest that the photosensitive BZ reaction is useful for creating spatio-temporal patterns depending on the geometric arrangement of excitable fields.

The photoelectron spectrum of pyrrolide was measured and the EA of pyrrolyl was determined to be 2.145 plus minus 0.010 eV. The EA value and the N-H BDE of pyrrole were combined in a thermochemical cycle to determine the gas-phase acidy of pyrrole.

Inverted (A/E) chemically induced dynamic electron polarization (CIDEP) is observed for random encounters of radical pairs such as the phenoxyl radical together with either e(sub aq)(super -) or the radical anion of benzoate. Inverted polarization (A/E) was found for e(sub aq)(super -) or the radical anions of benzoateand 4-methyl, 4-methoxy, and 4-carboxybenzoates in the presence of phenoxyl or 4-methylphenoxyl radicals.