A scanning Raman spectrometer and an Nd:YAG laser operating at 1.06 p n were used to observe the surfaceenhanced Raman scattering (SERS) of pyridine in yellow silver colloids. Enhancement factors for the triangle ring breathing vibration mode at 1006 cm-' and for the totally symmetric breathing mode at 1036 cm-' are about 16.5 and 21 times larger, respectively, than those found for excitation at 514.5 nm. The large enhancement factors for excitation in the near-infrared region suggest that further refinement of the theories currently proposed to explain the SERS effect is necessary.

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