標題: Classification of dynamic vibronic couplings in vibrational real-time spectra of a thiophene derivative by few-cycle pulses
作者: Kobayashi, Takayoshi
Wang, Zhuan
Otsubo, Tetsuo
電子物理學系
Department of Electrophysics
公開日期: 20-Dec-2007
摘要: 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.
URI: http://dx.doi.org/10.1021/jp076750d
http://hdl.handle.net/11536/10001
ISSN: 1089-5639
DOI: 10.1021/jp076750d
期刊: JOURNAL OF PHYSICAL CHEMISTRY A
Volume: 111
Issue: 50
起始頁: 12985
結束頁: 12994
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