Abstract

A rapid buildup (<20 ps) of excited state absorption of anthrone at 533 nm is observed following excitation at 355 nm in benzene solution at room temperature. Under the same conditions, weak excited state absorption of anthrone is observed in the solvent cis-1,3-pentadiene, a triplet quencher. These data suggest the possibility of rapid intersystem crossing in anthrone followed by slow internal conversion and/or slow vibrational relaxation in the triplet manifold. The use of a triplet quencher as solvent should be a reasonable test to distinguish between S n ← S 1 and TT absorption in favorable situations.

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