The effect of initial S1 vibrational mode on the photodissociation H2CO → H2+CO

SRL lifetimes of the jet‐cooled S1 H2CO molecules with low J’ and K’ values have been studied for the excitation of v’4=1 and 3, v5=1, and v’6=1. The v4 excitation leads to considerably faster S1 u S0 radiationless decay than the v’5 and v6 excitation, showing the vibrational mode specificity and correlation predicted by the molecular dissociation theory.

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