Correlating Continua

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Science  13 May 2005:
Vol. 308, Issue 5724, pp. 927
DOI: 10.1126/science.308.5724.927c

Surface-enhanced Raman scattering (SERS) occurs on certain noble metal surfaces that are rough or have high curvature, such as colloidal particles. Moore et al.have probed the nature of the broad continuum states that usually accompany the sharp, highly enhanced molecular vibrations by performing a two-dimensional covariance and correlation analysis of single-molecule SERS spectra. Vibrational modes for the species on the native silver particles prepared in citrate solution are correlated with a continuum that peaks at 3000 cm−1, but when the same particles were exposed to rhodamine 6G, the vibrational features correlated to a continuum that peaks at 1600 cm−1. Neither continuum has sharp features of its own and thus appears to be associated with the particles, either as active sites or a surface species, that have molecular specificity. — PDS

J. Am. Chem. Soc. 10.1021/ja043651u (2005).

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