... mol/L. m Hx) ljoo 1100 900 700 500 300 J I cm-' Figure 6. Electrode potential dependence of SERS spectra of 9-MAHt adsorbed on a silver electrode in 0. I mol/L KCI at pH 1 .O. Excitation wavelength 514.5 nm (ca. ... The Journal of Physical Chemistry, Vol. 95, No. ...