Abstract
The electron charge of Si adsorbates evaporated on a Si(001)-2×1 surface is studied by tracing their behavior after heating of the substrate. A reflection electron microscope (REM) is used to observe denuded zones which are created at the terrace edge and grow with heating time. It is shown that two effects affect the adsorbates. One is the thermal effect, where the zone width (x) is proportional to the square root of heating time (t). The other is the electric effect, where x is proportional to t. At the critical time tc, the electric effect becomes a dominant force and the Si adsorbates migrate independently on the substrate surface. In the region of t>t c, the adsorbates show the features of surface electromigration caused by the electric field. The adsorbates migrate in the same direction as that of the electric field applied for substrate heating. The results indicate that Si adsorbates are positively charged on the Si(001) surface.
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