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In this work,the time development of surface enhanced Raman intensities of the vibrationalmodes involving the ring skeleton and the C—H motions of the pyrazine molecule as the applied voltageon the silver electrode is shifted between -0.2 V and -0.5 V (vs.saturated calomel electrode)isreported.The observation shows that there are two processes of enhancement involved during thisshift of applied voltage.One is vibrational mode dependent while the other is not.The detailedbehavior of these two processes of enhancement is discussed along with the retarded response of theHelmholtz double layer structure to the change of the applied voltage on the electrode.