Rapid internal conversion in a symmetric molecule LD 700 studied by means of femtosecond fluorescence depletion
Guo Xun-Min(郭逊敏)a), Wan Yan(宛岩)a), Xia An-Dong(夏安东)a)†, Wang Su-Fan(王素凡)b), Liu Jian-Yong(刘建勇)c), and Han Ke-Li(韩克利)c)‡
aState Key Laboratory of Molecular Reaction Dynamics, and Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; bCollege of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China; c State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Abstract The rapid internal conversion dynamics at room temperature is determined by using the femtosecond time-resolved fluorescence depletion measurements of a complex solvated molecule of LD 700 (rhodamine 700) combined with steady-state absorption and fluorescence spectroscopy, as well as quantum chemical calculation. The molecule is excited by a 50fs laser pulse at 400nm which directly populated the highly excited singlet state, the rapid internal conversions (ICs) are observed, which leads to the directional changes of the emission transition moment following photoexcitation to the highly excited singlet state S5 of LD 700.
Received: 24 April 2008
Revised: 26 August 2008
Accepted manuscript online:
Fund: Project supported
by the National Natural Science Foundation of China (Grant Nos
20773139, 20825314 and 20833008), the State Key Program for Basic
Research of China (Grant Nos 2006CB806000 and 2007CB815200), and the
Knowledge Innovation Program of the Chi
Cite this article:
Guo Xun-Min(郭逊敏), Wan Yan(宛岩), Xia An-Dong(夏安东), Wang Su-Fan(王素凡), Liu Jian-Yong(刘建勇), and Han Ke-Li(韩克利) Rapid internal conversion in a symmetric molecule LD 700 studied by means of femtosecond fluorescence depletion 2009 Chin. Phys. B 18 142
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