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Large Relative Raman Shift for Molecules Adsorbed on Metallic Nano-particles |
| LI Xiao-Yun;XIA Yu-Xing;ZHAN Li;LENG Jiang-Hua |
| Spectroscopy Laboratory, Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 |
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LI Xiao-Yun, XIA Yu-Xing, ZHAN Li et al 2008 Chin. Phys. Lett. 25 2140-2143 |
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Abstract The enhancement of two order-of-magnitudes is observed in surface-enhanced Raman spectroscopy (SERS) of gases (CO, C2H2, C2H4, etc) adsorbed on nitric acid-roughened metal foil. In addition, some Raman lines of gases adsorbed on these active substrates show larger frequency shifts and linewidth broadening, compared with the Raman spectroscopy of free gases. Using the two-oscillator electromagnetic model, we explain this phenomenon. It is related to the large non-regular particles on the active substrate we prepared. It is found that the parameters of the surface-plasmon dispersion, the distance of molecules from the surface and the radius of particles play
crucial roles on the relative large Raman shifts.
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52.25.Tx
33.20.Fb
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Received: 19 December 2007
Published: 31 May 2008
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| PACS: |
52.25.Tx
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(Emission, absorption, and scattering of particles)
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33.20.Fb
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(Raman and Rayleigh spectra (including optical scattering) ?)
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