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Surface-enhanced Raman signals are reported from pyridine adsorbed onto Ag_1-xPdₓ for x0.04. For x0.05 the alloys do not support enhancement within our limit of detection. The quenching is due to the introduction of Pd d states which are involved in electron excitations that interfere with Ag's favorable free-electron-like behavior.
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Furtak et al. (1980) studied this question.
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