Abstract
A method is described for measuring local variations of the surface potential in one dimension on solid surfaces. The variations are determined by a contact potential difference (CPD) method utilizing a 6 μm thick wire as the vibrating reference electrode. The vibrating wire being placed at a distance of 15 μm above the surface can be moved under UHV conditions across the surface and the CPD variation is directly plotted on and XY-recorder. The spatial resolution amounts to about 50μm and the sensitivity for CPD changes is less than 20 mV. The method has been applied to studies of the surface diffusion of oxygen on a (110) tungsten single crystal plane.
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