Abstract
Using a combination of surface-sensitive Auger electron X-ray absorption fine structure and X-ray standing waves (XSW) we have determined the structure of the clean, cleaved CaO(100) surface reconstruction. We find that the surface atom positions are, within error, the same as those of the truncated bulk. The surface nature of the signal is reflected by the expected reduction of coordination numbers of surface atoms from six to five. XSW data taken simultaneously provide an independent determination of surface O and Ca positions relative to the bulk CaO(200) diffraction planes. These results are consistent with the surface EXAFS determinations.
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