Cs adsorption on the Si(100)2×1 surface was investigated by the field ion-scanning tunneling microscope. It was found that Cs atoms occupy the off-centered valley bridge site at the initial coverage. The result, together with Li/K adsorption, can be understood well based on the strong interaction between the directional dangling bonds and active alkali metal atoms.
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Hashizume et al. (1991) studied this question.