Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
Real-Time Spectroscopy of the Excited-State Excitons in Porphyrin J-Aggregates
Hideaki KanoTakayoshi Kobayashi
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2002 Volume 75 Issue 5 Pages 1071-1074

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Abstract

The excited exciton (S2-exciton originating from the second-excited state of the molecules) was studied by real-time spectroscopy with 30-fs pulses. The ultrafast dynamics due to the S2–S1 internal conversion process were clearly observed in the pump–probe signal. The signal was modulated by the coherent molecular vibrations with 241 ± 4 cm-1 and 319 ± 4 cm-1 frequencies. The phase of the oscillation indicates that not only the ground state but also the excited state contribute to the oscillatory signal. The excited-state wave-packet motion was explained by dynamic intensity borrowing mechanism from the S2 ⇄ S0-transitions to the S1 ⇄ S0-transitions.

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© 2002 The Chemical Society of Japan
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