Residence time in kink site positions

There is, in principle, the direct transfer between kink site position and electrolyte. This process, which must be taken into account at larger overpotentials, will not be discussed further. 

The transfer of an ad-atom into a kink site position can be described by a reaction of a metal ion with a kink site position 

The separation from a kink site position is a reaction of first order. The reaction rate is given by the rate equation 

In principle, the potential dependence of the rate constants must be taken into account. The potential dependence can be described by a Butler-Vohner exponential term exp(+ 3 iAz FE/RT). The coefficient, represents the part of the potential, which acts on the separation step and Az, is the charge transfer connected with the separation step. 

What happens to an atom in the kink site position This may be determined by the time interval in which the atom stays in the kink site position. This time is called residence time in the kink site position (in German Verweilzeit )- The residence time is the statistical average of the time between the arrival of the atom in the kink site position and its separation from the kink site position. During the residence time the process of separation from the kink site position competes with the arrival of new atoms. The residence time t in a kink site position is given by the reciprocal value of the rate constant of separation. 

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Selectivity constants and residence times in kink site positions... 

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