%0 Journal Article
%A Ibach, Harald
%A Giesen, Margret
%A Al-Shakran, Mohammad
%A Kibler, Ludwig A.
%A Jacob, Timo
%T Repulsive Interactions Induced by Specific Adsorption: Anomalous Step Diffusivity and Inadequacy of Nearest-Neighbor Ising Model (Part II Theory)
%J Surface science
%V 659
%@ 0039-6028
%C Amsterdam
%I Elsevier
%M FZJ-2017-02400
%P 52 - 57
%D 2017
%X This is Part II   of two closely related papers, where we show that the strong repulsive interaction caused by specifically adsorbed anions leads to a failure of the nearest-neighbor Ising model to describe structures on electrode surfaces. In this part, an analytical form of the step diffusivity is derived in terms of nearest and next-nearest neighbor interactions for steps with a mean direction along 〈110〉〈110〉 (the close-packed direction). With the help of a further analytical expression for the diffusivity of steps with 〈100〉〈100〉 mean orientation a simple scheme is developed whereby the nearest and next-nearest interaction energies can be extracted from the experimental values for the diffusivity along the 〈110〉〈110〉- and 〈100〉〈100〉-directions. The method is applicable to repulsive and attractive next-nearest neighbor interactions, both for surfaces in vacuum and in contact with an electrolyte. An example is presented in Part I, where we apply our approach to Au(100) in Br--, Cl-- and SO42—containing electrolytes.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000398009700008
%R 10.1016/j.susc.2016.03.022
%U https://juser.fz-juelich.de/record/828441