Real-time vibronic coupling dynamics in a prototypical conjugated oligomer

被引：58
作者：
Cerullo, G
Lanzani, G
Muccini, M
Taliani, C
De Silvestri, S
机构：
[1] Politecn Milan, Dipartimento Fis, CNR, CEQSE, I-20133 Milan, Italy
[2] Univ Sassari, Ist Matemat & Fis, I-07100 Sassari, Italy
[3] CNR, Ist Spettroscopia Mol, I-40129 Bologna, Italy
来源：
PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 01期
关键词：
D O I：
10.1103/PhysRevLett.83.231
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Phonon modes which are strongly coupled to the lowest optical transition of alpha-sexithienyl are directly probed in real time by coherent vibrational spectroscopy. The resonant excitation source is a tunable 10-fs optical parametric amplifier. We identify five strongly coupled phonon modes at omega(1) = 112 cm(-1) omega(2) = 299 cm(-1), omega(3) = 702 cm(-1), omega(4) = 1040 cm(-1), and omega(5) = 1454 cm(-1). Vibrational dephasing times are measured to be between 0.4 and 3 ps. We gain direct hints on potential energy anharmonicity by measuring the transient vibrational frequency within the first ps.
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页码：231 / 234
页数：4
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