1/e decay lifetimes τi and relative fit amplitudes ai
This will lead to steady-state behavior giving rise to an extremely weak S2(πσ*) transient that will be temporally indistinguishable from the decay of the S1(ππ*) state
it is interesting to note that the relative fit amplitude of the τ3 component remains largely invariant at all pump wavelengths where it is observed (278–241 nm).
For example, the gas-phase S1(ππ*) lifetime of 4-tert-butylcatechol following 267 nm excitation increases by a factor of 19 upon O–H deuteration as decay of this state proceeds via tunneling under a barrier formed by a S1(ππ*)/S2(πσ*) conical intersection
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