Infrared (IR) spectra of molecules adsorbed on a silver electrode surface have been investigated by using the Kretschmann attenuated-total-reflection (ATR) method, where a thin metal film evaporated on an ATR prism was used as the electrode. The sensitivity of this technique is ca. 50 times higher than that of reflection-absorption spectroscopy (RAS) technique due to a surface-enhanced IR absorption phenomenon associated with surface roughness of the evaporated metal film. The advantage of the ATR spectroscopy is discussed in comparison with RAS. The mechanism of the surface-enhanced IR absorption phenomenon is also discussed theoretically. © 1993.
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