The scanning tunneling microscope (STM) has been used to study the c(8×{}2) reconstruction of GaAs(100). High-resolution STM images imply this surface is composed of equal numbers of arsenic and gallium atoms, resolving disagreements in the interpretation of several previous experiments. The c(8×{}2) structure arises from an ordered arrangement of (4×{}2) subunits, with each subunit containing two As dimers and two Ga dimers.
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Skala et al. (1993) studied this question.
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