How does the study explain the long lifetimes estimated for the ~A excited state in methyl iodide (CH3I)?

Label:chem

Topic
The study explains the long lifetimes of the ~A excited state by considering the geometry and energy of the elusive conical intersection and the associated charge transfer.

From: "Evidencing an elusive conical intersection in the dissociative photoionization of methyl iodide", Chemical Science, Volume 15, Issue 9, 28 February 2024, Pages 3203-3213
Answer
The long lifetimes of the ~A excited state are explained by the significant geometrical modifications required to access the conical intersection, which traps the molecule in the ~A state for a considerable time before internal conversion and dissociation occur.
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