Abstract

High-resolution scanning tunnelling microscopy images show that low-coverage room temperature coadsorption of potassium on the Ni(100)(2 × 2)p4g-N surface occurs at step edges aligned preferentially along the 011 directions. The data indicate that the potassium atoms sit at the step edges a distance of 5.0±0.05 Å apart. A model is presented for the coadsorbed step structure.

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