The measurements were performed with an usual setup for surface-enhanced Raman spectroscopy: The Raman spectra were measured with a Spex 1406 spectrometer, the samples were illuminated with a Spectroscopy Instruments argon ion laser (A = 514 nm, 30 mW) and the spectra were detected by a Princeton Instruments optical multichannel analyzer under computer control. All experiments were performed in an electrochemical cell containing an inert platinum working electrode mechanically polished with diamond paste down to 0.25 pm, a counter electrode of platinum and a saturated calomel reference electrode. A standard silver cyanide bath was used with the concentrations represented in Table 1.

Tabl. 1: Electrolytes and concentrations.


c [mol l"1] kcn




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