Adiabaticity of potential surfaces in elementary reactions

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1. Adiabaticity of potential surface in photodissociation processesAtomic fragments produced in the photodissociation processes of molecules were detected with a laser multi-photon ionization technique and also with a laser-induced fluorescence technique. The non-adiabtic transitions between potential curves during the bnd break-up in the dissociation processes were investigated, which affect the electronic and translational states of the fragment atoms. The photodissociation processes of Cl_2, ICl, H_3O_2, SiH_4, Ethylene chlorides, and O_3 were studied.2. Adiabaticity of potential surfaces in reaction processesReactions of active atomic species, O(2P^<4\1>D), S(3P^<4\1>D), H(ls ^2S) and Xe(6p) with other molecules by collisions were investigated by observing the nascent translational and internal states of the reaction products. Since the photodissociation processes were used as sources of the active atom reactants and the products states were studied under single collision energies could be defined and angular distribution of the product velocities could be measured. The translational energies of the reaction products were calculated from the measured Doppler profiles. By measuring the fine structure branching ratios of product atoms and ro-vibronic states of product molecules, the adiabaticity of the potential curves in the reactions were investigated. The following reactions were studied, (1) O(^1D) + H_2, D_3 and HD, (2) O(^1D) + alkanes, (3) O(^1D) + CH_3OH, (4) SO(^1D) + H_2D_2 and HD, (5) S(^1D) + thiirane, (6) Ze(6p) + H_2 and HD, and (7) Xe(6p) + H_2O.