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UV pulses of 100 fs at 340 nm are utilised to excite pyrene to the vibrationally cold S 2 state. Population and depopulation processes occurring in the S 2  state are investigatedby transient absorption spectroscopy with a white continuum probe. In the first 400 fsafter excitation it is possible to measure the growth and disappearance of a band at585 nm which is assigned to the S 14 ←S 2  transition. As a consequence of the internalconversion process from S 2  to S 1  state, the disappearance of the 585 nm band and thegrowth of the transient spectrum due toS  n    ←S 1  transitions can be observed. Kineticmeasurements of the S 2  decay and S 1  growing signals provide an estimate of the rate ofinternal conversion which occurs with a time constant of 150±50 fs.

Direct Observation of S2–S1 Internal Conversion in Pyrene by Femtosecond Transient Absorption

Direct Observation of S₂–S₁ Internal Conversion in Pyrene by Femtosecond Transient Absorption