Early events of energy relaxation in all-trans-β-carotene following sub-10 fs optical-pulse excitation -: art. no. 241104

被引：57

作者：

Cerullo, G ^{[1
]}

Lanzani, G ^{[1
]}

Zavelani-Rossi, M ^{[1
]}

De Silvestri, S ^{[1
]}

机构：

[1] Politecn Milan, Dipartimento Fis, Ist Nazl Fis Mat, CNR,Ctr Elettron Quantist & Strumengaz Elettron, I-20133 Milan, Italy

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.63.241104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The rapid internal conversion to the lowest lying 2(1)A(g)(-) state following photoexcitation is studied in all-trans-beta -carotene with unprecedented time resolution. Visible optical pulses with time duration of 7 fs are used to resonantly excite and probe the optical dynamics of the molecule dissolved in solution. A picture for the relaxation dynamics during the first 100 fs following photoexcitation is proposed based on time-resolved transmission difference spectra and kinetics. Coherent nuclear motion is observed, assigned to impulsive stimulated resonant Raman scattering. Thermalization of the 2(1)A(g)(-) state, evident from excited-state spectral evolution, is rather slow, indicating that the higher lying vibrational levels are populated during energy transfer within the photosynthetic systems.

引用

页数：4