UM
Resonant Raman technique-a powerful tool for exploring electron-phonon coupling in Se nanoclusters
Li I.L.2; Zhai J.P.1; Tang Z.K.1; Ruan S.C.2; Zhang M.2
2006-03-31
Source PublicationProceedings of SPIE - The International Society for Optical Engineering
Volume6029
AbstractRaman scattering is an inelastic process, in which we can obtain information about material lattice vibration frequencies. If the wavelength of the excitation laser is within the electronic spectrum of the material, the intensity of some Raman-active vibrations will increase enormously. This resonant Raman effect can be quite useful to explore the electron-phonon coupling in the substance. In this article, we report the investigations on the electron-phonon coupling effect in Se nanoclusters using resonant Raman technique. Up to 10 different laser lines are used in the experiment. The Raman intensity strongly depends on the energy of the laser lines used for excitation. The one-phonon symmetric A modes for Se single helix and Se rings are enhanced in the vicinity of their absorption bands. Detailed analysis shows that the Raman intensity in the high frequency range 450 - 550 cm is a sum of individual second-order Raman scattering intensities for the confined Se species. These two-phonon Raman shifts occur at twice the frequency shift of the first-order Raman lines, and their intensities are also enhanced when the excitation laser energy matches an electronic transition in Se nanoclusters.
KeywordElectron-phonon coupling Nanoclusters Resonant raman effect
DOI10.1117/12.667691
URLView the original
Language英語
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Document TypeConference paper
CollectionUniversity of Macau
Affiliation1.Hong Kong University of Science and Technology
2.Shenzhen University
Recommended Citation
GB/T 7714
Li I.L.,Zhai J.P.,Tang Z.K.,et al. Resonant Raman technique-a powerful tool for exploring electron-phonon coupling in Se nanoclusters[C],2006.
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