Observation of Herzberg-Teller-type wave packet motion in porphyrin J-aggregates studied by Sub-5-fs spectroscopy

Hideaki Kano, Takashi Saito, Takayoshi Kobayashi

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84 Citations (Scopus)

Abstract

An interaction of the Frenkel exciton with the molecular vibration has been studied using sub-5-fs multichannel real-time spectroscopy. The coherent molecular vibration with a 135 ± 4 fs period is observed in the time-frequency two-dimensional difference absorption spectrum. An analysis of the phase and amplitude of the oscillation has revealed that both of the negative (bleaching and photoinduced emission) and positive (photoinduced absorption) signals are modulated synchronously. The experimental result is well explained in terms of a transition dipole moment modulated by a dynamic intensity borrowing from an intense B transition to a weak Q transition through the vibronic interaction. The wave packet observed in the present study can be classified as a Herzberg-Teller type in contrast with the frequently studied conventional Franck-Condon type.

Original languageEnglish
Pages (from-to)3445-3453
Number of pages9
JournalJournal of Physical Chemistry A
Volume106
Issue number14
DOIs
Publication statusPublished - Apr 11 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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