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. 2003 Jul 2;100(15):8638–8643. doi: 10.1073/pnas.1133217100

Fig. 7.

Fig. 7.

Bulk and single-molecule Raman spectra of 4-mercaptopyridine on Tollens reaction silver surfaces. The CCD exposure time is 5 s for each spectrum and the excitation is 5 μW at 632.8 nm. Spectra 2–5 are representative Raman spectra of the same spot with time. Spectrum 6 is the bulk surface-enhanced Raman scattering spectrum of 4-mercaptopyridine for comparison. Spectrum 1 is the Raman spectrum of toluene on coverglass by using the same optical geometry and excitation power and a CCD integrated time of 15 s. The assignments of several prominent modes are listed on the spectra. In particular, they are C—H in plane wag (843 cm–1), C—N double bond stretch (1,200 cm–1), etc.