Abstract
The growth and structure of ultrathin chromium films on Pt(111) have been studied using low-energy He + ion scattering spectroscopy, X-ray photoelectron spectroscopy, low energy electron diffraction and scanning tunneling microscopy. Upon initial deposition at room temperature, the Cr atoms migrate along the Pt terraces and populate the step edges. Further growth results in two-dimensional islands of chromium developing from the step edges and across the Pt terraces. The film is pseudomorphic to the Pt(111) substrate. At coverages above 3 ML, chromium forms three-dimensional elongated islands oriented along the three closepacked directions of the Pt(111) surface. The chromium overlayer adopts a bcc (110) surface structure with the close-packed overlayer directions, 〈111〉, aligned with the close-packed Pt(111) directions, 〈110〉. The presence of the Cr overlayer was found to electronically perturb the Pt surface atoms leading to a redistribution of charge between Pt and Cr.
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