AI Article Synopsis
- Pump-probe spectroscopy was conducted using ultra-short 6.7 fs pulses to study vibrational effects on electronic transitions in a quinoid thiophene molecule.
- The analysis focused on how molecular vibration affects electronic transition probabilities through vibronic coupling, monitoring changes in spectral features like peak frequency and intensity.
- The modulation mechanisms were categorized into Condon and non-Condon types, with wave packet motions distinguished by different derivative orders related to potential changes during vibronic transitions.
Article Abstract
Pump-probe spectroscopy was performed with a few cycle pulses of 6.7 fs duration. The electronic transition intensity modulation was induced by molecular vibration in a quinoid thiophene molecule in solution. The real-time vibrational features were analyzed in terms of dependence of vibrational amplitude and phase on probe photon energy. The electronic transition probability is modulated by molecular vibration via vibronic coupling. Changes in the spectral shape and intensity of the time-resolved spectrum were studied by tracking characteristic spectral features including the peak frequency and intensity, spectral bandwidth, and band-integrated intensity. From the analysis the modulation mechanisms were classified into two groups: (1) Condon type and (2) non-Condon type. The features of the wave packet motions were also classified into zeroth-order derivatives due to quasi-pure non-Condon type and first- and second-order derivative types due to the displacement of the potential minimum and the potential curvature change associated with the relevant vibronic transition, respectively.
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| http://dx.doi.org/10.1021/jp076750d | DOI Listing |
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