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; Xu, GX
AbstractStrong 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.
KeywordAnalytical Methods Enhancement Feed-back Mechanism Lanthanides Raman Spectroscopy Structural Probe
Indexed BySCI
WOS IDWOS:000179801400005
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Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorXu, YZ
Affiliation1.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
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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.
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