When the 3 2A state of D2COH is excited broadened lines are observed and both D and H atoms are produced. When the 2 2A state is excited the spectrum is quite diffuse. These experimental observations can be explained by conical intersections connecting the 3 2A and 2 2A states and the 2 2A and 1 2A states. The 2 2A←1 2A excitation leads to rapid dissociation as a result of a seam of conical intersections connecting the 2 2A and 1 2A states. The relevant region of the 2 2A–1 2A seam of conical intersections occurs for long R(O–H) and can lead to ground state D2CO+H. Following the 3 2A←1 2A excitation a low energy portion of the 2 2A–3 2A seam of conical intersection can be accessed. This portion of the 2 2A–3 2A seam occurs for long R(D–C). From this seam of conical intersections, paths on the 2 2A potential energy surface lead to portions of the 2 2A–1 2A seam from which either of the ground state dissociation products DCOH+D, or D2CO+H are accessible.

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