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题名: Rotational reorientation dynamics of Rhodamine 700 in different excited states
作者: Zhou, Panwang1, 2;  Liu, Jianyong1;  Song, Peng1, 2;  Han, Keli1;  He, Guozhong1
关键词: Rotational reorientation ;  Rhodamine 700 ;  Stimulated emission pumping fluorescence depletion spectroscopy ;  Internal conversion ;  Femtosecond
刊名: JOURNAL OF LUMINESCENCE
发表日期: 2009-03-01
DOI: 10.1016/j.jlumin.2008.10.002
卷: 129, 期:3, 页:283-289
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Optics
研究领域[WOS]: Optics
英文摘要: The rotational reorientation dynamics of rhodamine 700 (LD700) in the first (S(1)) and the fifth (S(5)) excited state in three aprotic polar solvents have been investigated using femtosecond time-resolved stimulated emission pumping fluorescence depletion (FS TR SEP TD) spectroscopy. In both excited states, the overall rotational relaxation of LD700 occurs on a time scale of 40-230 ps depending on the solvent, and a quantitative analysis of this time constant has been performed using the Stokes-Einstein-Debye (SED) hydrodynamic theory combined with the extended charge distribution model developed by Alavi and Waldeck. The experimentally measured reorientation times for LD700 in S(5) are smaller than those in S(1), which is in accord with the predictions by the SED theory. In addition, for LD700 in S(5), a rapid initial decrease on the time scale less than 0.5 ps has been found. According to our analysis, this fast component may account for the rapid internal conversion from S(5) to S(1), and the rate of internal conversion was found to be sensitive to the solvent polarity. (C) 2008 Elsevier B.V. All rights reserved.
关键词[WOS]: DIELECTRIC FRICTION MODELS ;  ELECTROLYTE-SOLUTIONS ;  MOLECULAR ROTATION ;  POLAR-SOLVENTS ;  PYRROLOPYRROLE DERIVATIVES ;  CHARGE-DISTRIBUTION ;  CHEMICAL MOLECULES ;  BOUNDARY-CONDITION ;  NONDIPOLAR PROBES ;  PHENOXAZINE DYES
语种: 英语
WOS记录号: WOS:000262884400021
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141423
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Liaoning, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

Recommended Citation:
Zhou, Panwang,Liu, Jianyong,Song, Peng,et al. Rotational reorientation dynamics of Rhodamine 700 in different excited states[J]. JOURNAL OF LUMINESCENCE,2009,129(3):283-289.
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