On the O2+–C2D2 Reaction: An Endoergic Stripping Process

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Abstract
We have determined the product velocity vector distributions for the endoergic (ΔE 0°=2.23 eV) atom abstraction reaction O 2 + ( C 2 D 2 , C 2 D ) O 2 D + at a number of values of the initial relative energy. Deuterium atom abstraction occurs at higher energies by a spectator stripping process. An energy threshold for the zero angle reactive scattering process is observed when the energy of the O 2 + projectile relative to the abstracted atom is equal to the endoergicity of the reaction. The results show that the spectator stripping process is not to be uniquely associated with exoergic reactions or those which proceed along monotonically decreasing potential energy surfaces.

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