Abstract
AbstractThe vibronic coherence of β‐carotene in benzene has been investigated by means of transient grating spectroscopy using sub 20‐fs optical pulses. The coherent oscillations with a period of a few tens of femtoseconds have been clearly observed, which reflect the C‐C and C=C stretching modes and the C‐CH3 rocking mode of the polyene backbone. We found that the signal is very sensitive to the excitation wavelength. Calculations based on a Brownian oscillator model were performed. We show that the experimental results are well explained by properly considering the excitation pulse shapes. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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