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Featured articles from Cave & Karst Science Journals
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PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Surface Science, 2003, Vol 547, Issue 0, p. 19-26
X-ray standing wave study of the Sr/Si(001)-(2 x 3) surface
Goodner D. M. , Marasco D. L. , Escuadro A. A. , Cao L. , Tinkham B. P. , Bedzyk M. J. ,
Abstract:
Sub-monolayer surface phases of Sr on Si(0 0 1) have been studied with low-energy electron diffraction (LEED) and X-ray standing waves (XSW). A (3 x 1) phase was observed after depositing 0.6-0.8 ML Sr on room-temperature Si(0 0 1). Annealing at 750-800degreesC caused a portion of the Sr to desorb and resulted in a sharp (2 x 3) LEED pattern. Normal Si(0 0 4) and off-normal Si(0 2 2) and Si(1 11) XSW measurements made on the (2 x 3) phase indicate that Sr atoms must sit at either cave or bridge sites. The XSW results also suggest that if a sufficiently low anneal temperature is used. the (2 x 3) phase co-exists with short-range ordered regions of Sr atoms located at valley-bridge sites. (C) 2003 Elsevier B.V. All rights reserved
Sub-monolayer surface phases of Sr on Si(0 0 1) have been studied with low-energy electron diffraction (LEED) and X-ray standing waves (XSW). A (3 x 1) phase was observed after depositing 0.6-0.8 ML Sr on room-temperature Si(0 0 1). Annealing at 750-800degreesC caused a portion of the Sr to desorb and resulted in a sharp (2 x 3) LEED pattern. Normal Si(0 0 4) and off-normal Si(0 2 2) and Si(1 11) XSW measurements made on the (2 x 3) phase indicate that Sr atoms must sit at either cave or bridge sites. The XSW results also suggest that if a sufficiently low anneal temperature is used. the (2 x 3) phase co-exists with short-range ordered regions of Sr atoms located at valley-bridge sites. (C) 2003 Elsevier B.V. All rights reserved
Keywords: alkaline earth metals, ba adsorption, bridge, c, cave, diffraction, interface, low energy electron diffraction (leed), low index single crystal surfaces, molecular beam epitaxy, oxides, pattern, phase, region, regions, room-temperature, scanning-tunneling-microscopy, si(100) surface, silicon, site, sites, sr, sr adsorption, surface, surface structure,morphology,roughness,and topography, temperature, thin-films, time, times, usa, x-ray, x-ray standing waves,