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Utilizing a special roughening procedure and a difference spectrum method, we have studied electrolyte ion effect on surface enhanced Raman scattering (SERS) of interfacial water molecules at silver electrodes, for the first time, in solutions free of (pseudo-) halide ions. The SERS obtained from alkali sulfate or perchlorate solutions in the negative potential range (-2.0 to -1.3 V) reveals that...
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