Wave-packet dynamics of Herzberg-Teller-type in porphyrin J-aggregates studied by sub-5-fs spectroscopy

Takayoshi Kobayashi, Hideaki Kano

Research output: Contribution to journalArticlepeer-review

Abstract

Multi-channel sub-5-fs real-time spectroscopy was applied to molecular J-aggregates to shed light on the exciton-vibration coupling in the one-dimensional Frenkel exciton system, which shows small exciton-vibration interaction manifested by small Stokes shift of the fluorescence. The coherent molecular vibration with a 274±44 cm-1 frequency is observed in the time-frequency two-dimensional difference absorption spectrum. The phase and amplitude of the oscillation has been analyzed to reveal that both of the negative (bleaching and photo-induced emission) and positive (photo-induced 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 Soret-band (B-band) 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 conventional Franck-Condon type frequently studied in relation with wave-packet control experiments.

Original languageEnglish
Pages (from-to)115-135
Number of pages21
JournalNonlinear Optics Quantum Optics
Volume31
Issue number1-4
Publication statusPublished - 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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