Rapid internal conversion in a symmetric molecule LD 700 studied by means of femtosecond fluorescence depletion |
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| Authors: | Guo Xun-Min Wan Yan Xia An-Dong Wang Su-Fan Liu Jian-Yong and Han Ke-Li |
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| Affiliation: | College of Chemistry and Materials Science,
Anhui Normal University, Wuhu 241000, China; State Key Laboratory of Molecular Reaction Dynamics,
and Beijing National Laboratory for Molecular Sciences (BNLMS),
Institute of Chemistry, Chinese Academy of Sciences,
Beijing 100190, China; State Key Laboratory of Molecular Reaction Dynamics,
Dalian Institute of Chemical Physics, Chinese Academy of Sciences,
Dalian 116023, China |
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| 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. |
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| Keywords: | femtosecond fluorescence
depletion internal conversion (IC) solvation |
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