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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.71: Poster

Mittwoch, 16. März 2011, 17:30–21:00, P4

Development of a Raman Correlation Spectroscopy Experiment — •Aude Barbara^1,2, Tomas Lopez-Rios¹, Pascal Quémerais^1,3, Martin Helfrich², and Lukas Eng² — ¹Institut Néel, CNRS-UJF, Grenoble, France — ²IAPP, TU Dresden, Germany — ³MPI-PKS, Dresden, Germany

We develop a Raman Correlation Spectroscopy (RCS) experiment. Analogous to Fluorescent Correlation Spectroscopy, we measure the time-dependence of Raman band intensities of particles in solution. The main advantages of Raman spectroscopy is its direct chemical selectivity and its non-dependence to the wavelength while its biggest drawback its cross-section that may be up to 10¹⁴ times smaller than that of the fluorescence. However, adding metallic colloids may significantly enhance the Raman signal. Taking advantage of this SERS (Surface Enhanced Raman Scattering) effect has two goals: (i) increase the sensibility of the RCS experiments and (ii) establish a direct link between the Raman exaltation and the size of the metallic colloids which can be simultaneously measured. More insight into the SERS mechanism could thus be obtained. We present the preliminary experiments that aim at demonstrating the capabilities of the set-up to perform reliable time-dependent and particle sizing measurements. Experiments done with fluorescent and Raman light on toy-system will also be presented.