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We have conducted femtosecond transient absorption experiments on the excited-statedynamics of trans- and cis-hexatriene (HT) in solution. The transient absorption in thevisible region decays with the time constant of about 500 fs, indicating that the internalconversion (IC) to the ground state occurs quite efficiently. The bleach recovery signalcontains several time constants. The vibrational relaxation in the ground state occurs in10–20ps and the slow relaxation process, which may be due to the conformationalchange around C—C single bond, proceeds in a subnanosecond time scale.

Femtosecond Transient Absorption Studies of Simple Polyenes in Solution