Abstract
Atomically ordered array of Cu atoms on a clean single-crystal Cu (100) surface has been observed on both occupied and empty sample states by scanning tunneling microscopy in ultrahigh vacuum at room temperature. An average corrugation amplitude of ∼0.4 Å is found in the empty state while it is only ∼0.06 Å in the occupied state. Atomic spacing is measured and the results are in good agreement with the known copper interatomic distance of 2.6 Å.
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