The 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.
|Journal||Physica Status Solidi (C) Current Topics in Solid State Physics|
|Issue number||SUPPL. 1|
|Publication status||Published - 2009|
ASJC Scopus subject areas
- Condensed Matter Physics