Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 105, Issue 2, Pages 413-419Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp0026134
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Sub-5-fs spectroscopy of porphyrin J-aggregates reveals a coherent molecular vibration coupled to the Frenkel exciton. The bleaching and induced absorption signals show synchronous oscillations with the frequency of 244 cm(-1). The coherent oscillation is explained by a modulated transition dipole moment, which is due to a dynamic intensity borrowing from the intense B-transition to the weak Q-transition through the ruffling mode with the 244 cm(-1)-frequency.
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