Fundamental processes of surface enhanced Raman scattering detected with transient reflecting grating spectroscopy

We investigated ultrafast photoexcited electrons dynamics in relation to the surface enhanced Raman scattering (SERS) effect, using the transient reflecting grating spectroscopy method. We observed that only SERS-active samples had transfer of photoexcited electrons from a metal surface to adsorbed...

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Bibliographic Details
Published in:Review of Scientific Instruments 2003-01, Vol.74 (1), p.910-912
Main Authors: Shibamoto, Kohei, Katayama, Kenji, Fujinami, Masanori, Sawada, Tsuguo
Format: Article
Language:English
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Summary:We investigated ultrafast photoexcited electrons dynamics in relation to the surface enhanced Raman scattering (SERS) effect, using the transient reflecting grating spectroscopy method. We observed that only SERS-active samples had transfer of photoexcited electrons from a metal surface to adsorbed molecules within 200 fs followed by return of these charge transferred electrons to the metal within several picoseconds. By analyzing charge transfer (CT) processes, we were able to identify the main influential factors of the adsorption state, stay time at adsorbed molecules, and quantity of CT carriers. That these obtained factors had correlations to each other may lead to clarification of the CT processes within several picoseconds with regard to the SERS enhancement mechanism.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1524007