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Abstract
The effect of hydrogen termination on Ba reaction on the Si(100) surface at the initial stage of Ba adsorption was investigated by means of scanning tunneling microscopy (STM). On the bare Si(100) surface, Ba atoms form chain-shaped structures of Ba coverage up to 1/3 monolayer (ML), which extend perpendicular to the Si dimer row. The chain-shaped structure can change its shape because of the movement of Ba atom along the dimer row. On the other hand, in the case of Ba adsorption on a monohydrogenated Si(100)2×1 surface, Ba atoms make clusters, particularly at defect sites. In addition, Ba clusters can move across the dimer row.
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