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Roaming is a recently verified unusual pathway to molecular products from unimolecular dissociation of an energized molecule. Here we present the evidence for this pathway for H2CO and CH3CHO. Theoretical analysis shows that this path visits the plateau region of the potential energy surface near dissociation to radical products. It is not clear whether roaming is a distinct isolated pathway, in addition to the conventional one via the well-known molecular saddle-point transition state. Evidence is presented to suggest that the two pathways may originate from a single, but highly complicated, dividing surface. Other examples of unusual reaction dynamics are also reviewed.
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Supplemental Movie 1: Dissociation via the conventional saddle-point. Download movie file (AVI)
Supplemental Movie 2: Dissociation via the roaming pathway. Download movie file (AVI)
Supplemental Movie 3: New animation showing another roaming trajectory in H2CO dissociation. Download movie file (MOV)
Supplemental Movie 4: Change in structures in going from the roaming saddle point to the conventional molecular saddle point in H2CO, corresponding to Figure 8. Download movie file (MOV)
Supplemental Movie 5: OH+NO2 trajectory illustrating long-range isomerization from HOONO to HONO2. Download movie file (MOV)