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Ultrafast 1Bu → 2Ag internal conversion. (a) Transient absorption timeslices from sub-30 fs TA on monomeric AXT in DMSO, showing smooth transition from 1Bu (PIA below 1.5 eV) to 2Ag (PIA above 1.8 eV). No other electronic state can be identified. Arrows indicate direction of spectral change. The corresponding decay kinetics (symbols) in (b) DMSO and (c) acetone can be well described with an exponential time constant (lines) of 105 or 125 fs, respectively.
