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Abstract:
Using a new approach, the interference SHG anisotropy, it is possible to unambiguously evaluate the nonlinear susceptibility coefficients, which describe the isotropic and anisotropic response of a metal electrode. We report on a first application of this method to single crystalline silver electrodes in a 50 mM aqueous solution of NaClO4. The isotropic coefficient a shows the strongest dependence on the electrode potential. Theory predicts that the real part ar=Re(a) should have a minimum near the potential of zero charge. A normalized plot of ar vs. the surface charge density σ shows a good agreement between experiment and theory in the range −20 μC cm−2<σ<20 μC cm−2.
