A new mechanism of Raman enhancement and its application

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	A new mechanism of Raman enhancement and its application
	Xu, YZ ; Wu, JG ; Sun, WX ; Tao, DL ; Yang, LM ; Song, ZF ; Weng, SF ; Xu, ZH ; Soloway, RD ; Xu, DF
刊名	CHEMISTRY-A EUROPEAN JOURNAL
	2002-12-02
卷号	8 期号:23 页码:5323-5331
关键词	Analytical Methods Enhancement Feed-back Mechanism Lanthanides Raman Spectroscopy Structural Probe
ISSN号	0947-6539
英文摘要	Strong electronic Raman bands corresponding to the transition between I-4(9/2) and manifolds of Nd3+, caused by a Raman-enhancement effect, are observed in the FT-Raman spectrum of Nd2O3. Neither resonance enhancement (RR) nor surface enhancement (SERS) accounts for the Raman enhancement observed here. We propose a new mechanism of Raman enhancement called the "feed-back" mechanism. A YAG laser excites the final state of the Raman transition (I-4(11/2), of Nd3+) to the F-4(3/2) state and causes a significant decrease in the population of Nd3+ at the I-4(11/2) state. This causes the population ratio of Nd3+ at I-4(9/2) and I-4(11/2), to deviate from the value required by Boltzmann's law. To restore equilibrium, Raman scattering is enhanced so that more Nd3+ ions are brought from the I-4(9/2) state to the I-4(11/2) state. Ibis hypothesis gets support from the temperature-variable FT-Raman spectroscopic results. Additionally, obvious differences between the Stokes and anti-Stokes Raman spectrum of Nd3+ provide further evidence to support the feed-back mechanism. The Raman-enhancement effect confers on the electronic Raman bands a special ability to reflect the variation of coordinated structure around metal ions. The structural variations in polymer-metal ion composites and biomineralization systems have been investigated by using the electronic Raman bands.
语种	英语
出版者	WILEY-V C H VERLAG GMBH
WOS记录号	WOS:000179801400005
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/78389]
专题	中国科学院化学研究所
通讯作者	Xu, YZ
作者单位	1.Peking Univ, Dept Chem, State Key Lab Rare Earth Mat Chem & Applicat, Beijing 100871, Peoples R China 2.Chinese Acad Sci, State Key Lab Polymer Phys & Chem, Inst Chem, Beijing 100080, Peoples R China 3.Peking Univ, Dept Phys, Beijing 100871, Peoples R China 4.Univ Texas, Med Branch, Galveston, TX 77550 USA
推荐引用方式 GB/T 7714	Xu, YZ,Wu, JG,Sun, WX,et al. A new mechanism of Raman enhancement and its application[J]. CHEMISTRY-A EUROPEAN JOURNAL,2002,8(23):5323-5331.
APA	Xu, YZ.,Wu, JG.,Sun, WX.,Tao, DL.,Yang, LM.,...&Xu, GX.(2002).A new mechanism of Raman enhancement and its application.CHEMISTRY-A EUROPEAN JOURNAL,8(23),5323-5331.
MLA	Xu, YZ,et al."A new mechanism of Raman enhancement and its application".CHEMISTRY-A EUROPEAN JOURNAL 8.23(2002):5323-5331.