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000057108 0247_ $$2DOI$$a10.1016/j.susc.2007.02.012
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000057108 084__ $$2WoS$$aChemistry, Physical
000057108 084__ $$2WoS$$aPhysics, Condensed Matter
000057108 1001_ $$0P:(DE-Juel1)128800$$aBeltramo, G. L.$$b0$$uFZJ
000057108 245__ $$aA Novel Approach to Measure the Step Line Tension and the Step Dipole Moment on Vicinal Au(001) Electrodes
000057108 260__ $$aAmsterdam$$bElsevier$$c2007
000057108 300__ $$a1876 - 1885
000057108 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000057108 440_0 $$05673$$aSurface Science$$v601$$x0039-6028
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000057108 520__ $$aIn this paper we introduce a new experimental approach to determine the potential dependence of the step line tension on metal electrodes in contact with an electrolyte: (0 0 1) and (1 1 n) surfaces of single crystal gold electrodes were investigated by impedance spectroscopy in solutions containing weakly adsorbing anions, such as CIO4-, F- and SO42-. Within the limits of error the shift in the potential of zero charge is proportional to the step density of the vicinal surfaces indicative of a well-defined dipole moment per step length. The dipole moments per step atom are 6.8 +/- 0.8, 5.2 +/- 0.4, 5.8 +/- 0.5 x 10(-3) e angstrom for SO42-, ClO4-, and F- containing electrolytes, respectively. Using the values for the pzc and the potential dependence of the capacitance curves, the potential dependence of the surface tension of the vicinal surfaces is determined. The line tension of the steps is then calculated from the difference between the surface tension of the stepped and the step free surface. Our results represent the first experimental confirmation of a recent theoretical model proposing that in absence of specifically adsorbed ions the step line tension should decrease (roughly linear) with potential. (c) 2007 Elsevier B.V. All rights reserved.
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000057108 65320 $$2Author$$astepped electrodes
000057108 65320 $$2Author$$avicinal
000057108 65320 $$2Author$$aSTM
000057108 65320 $$2Author$$astep line tension
000057108 65320 $$2Author$$astep dipole moment
000057108 65320 $$2Author$$apotential of zero charge
000057108 65320 $$2Author$$aAu(001)
000057108 65320 $$2Author$$aelectrolyte
000057108 7001_ $$0P:(DE-Juel1)VDB5414$$aIbach, H.$$b1$$uFZJ
000057108 7001_ $$0P:(DE-Juel1)VDB17708$$aMüller, J. E.$$b2$$uFZJ
000057108 7001_ $$0P:(DE-Juel1)4744$$aGiesen, M.$$b3$$uFZJ
000057108 773__ $$0PERI:(DE-600)1479030-0$$a10.1016/j.susc.2007.02.012$$gVol. 601, p. 1876 - 1885$$p1876 - 1885$$q601<1876 - 1885$$tSurface science$$v601$$x0039-6028$$y2007
000057108 8567_ $$uhttp://dx.doi.org/10.1016/j.susc.2007.02.012
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