Abstract
Deposition of Cs on clean Cu(100) forms hexagonal close-packed structures. Preadsorption of oxygen causes a disordering, a substantial increase in density of atoms, and a decrease of electron density in the Cs overlayer. The work function minimum Ф min and maximum Ф max of Cs on Cu(100) are lowered and shift to a longer time Cs deposition with preadsorbed oxygen. The results suggest that oxygen forms oxide-like bonds with Cu(100).
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