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The attenuated total reflection (ATR) method was applied to obtain the first layer enhancement in the case of pyridine adsorbed on Cu(100), (111) and (110) and a (110) vicinal surface, the values being 3, 19, 40 and 83 respectively. By comparison of the Raman bands and the enhancement at the Cu(111) electrode with UHV measurements, these bands are assigned to species adsorbed at surface defects of unknown structure. The strong potential dependence of the Raman signal can be explained by a photon-driven charge-transfer process. An electronic Raman scattering process causes the background signal, but the face specificity is not yet understood. The stability of the surface structure with the variation of the electrode potential was shown in the case of the (110) vicinal surface. © 1998 John Wiley & Sons Ltd.
Bruckbauer et al. (1998) studied this question.