A region of the 1, 2A2 seam of accidental conical intersections in the vinoxy radical exhibits a novel topography which has important consequences for both upper-state to lower-state and lower-state to upper-state nonadiabatic transitions. The impact of this topography on these nonadiabatic transitions is described. We also considered the possibility that this conical intersection seam provides a dynamical bottleneck to the photodissociation of vinoxy to H+ketene by facilitating nonadiabatic recrossing. Our analysis of the conical topographies and the proximity of the conical intersections to the transition state for dissociation to H+ketene does not support nonadiabatic recrossing as an effective dynamical bottleneck blocking the H+ketene channel.

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