Ultrafast vibrational and thermal relaxation of dye molecules in solutions

	Ultrafast vibrational and thermal relaxation of dye molecules in solutions
	Liu, JY; Fan, WH; Han, KL; Deng, WQ; Xu, DL; Lou, NQ
刊名	journal of physical chemistry a
	2003-12-18
卷号	107 期号:50 页码:10857-10861
产权排序	1;1
英文摘要	intra- and intermolecular relaxations of dye molecules are studied after the excitation to the high-lying excited states by a femtosecond laser pulse, using femtosecond time-resolved stimulated emission pumping fluorescence depletion spectroscopy (fs tr sep fd). the biexponential decays indicate a rapid intramolecular vibrational redistribution (ivr) depopulation followed by a slower process, which was contributed by the energy transfer to the solvents and the solvation of the excited solutes. the time constants of ivr in both oxazine 750 and rhodamine 700 are at the 290-360 fs range, which are insensitive to the characters of solvents. the solvation of the excited solutes and the cooling of the hot solute molecules by collisional energy transfer to the surrounding takes place in the several picoseconds that strongly depend on the properties of solvents. the difference of lewis basicity and states density of solvents is a possible reason to explain this solvent dependence. the more basic the solvent is, which means the more interaction between the solute and the neighboring solvent shell, the more rapid the intermolecular vibrational excess energy transfer from the solute to the surroundings and the solvation of the solutes are. the higher the states density of the solvent is, the more favorable the energy transfer between the solute and solvent molecules is.
WOS标题词	science & technology ; physical sciences
类目[WOS]	chemistry, physical ; physics, atomic, molecular & chemical
研究领域[WOS]	chemistry ; physics
关键词[WOS]	energy-transfer ; fluorescence spectroscopy ; theoretical-analysis ; stimulated-emission ; hot molecules ; dynamics ; absorption ; depletion ; solvents ; systems
收录类别	SCI
原文出处	true
语种	英语
WOS记录号	WOS:000187279000001
公开日期	2010-11-30
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/82429]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Liu, JY,Fan, WH,Han, KL,et al. Ultrafast vibrational and thermal relaxation of dye molecules in solutions[J]. journal of physical chemistry a,2003,107(50):10857-10861.
APA	Liu, JY,Fan, WH,Han, KL,Deng, WQ,Xu, DL,&Lou, NQ.(2003).Ultrafast vibrational and thermal relaxation of dye molecules in solutions.journal of physical chemistry a,107(50),10857-10861.
MLA	Liu, JY,et al."Ultrafast vibrational and thermal relaxation of dye molecules in solutions".journal of physical chemistry a 107.50(2003):10857-10861.