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A STRUCTURAL STUDY OF THE AL(111) (ROOT-3X-ROOT-3)R30-DEGREES-RB PHASE AT DIFFERENT TEMPERATURES
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UNSPECIFIED (1994) A STRUCTURAL STUDY OF THE AL(111) (ROOT-3X-ROOT-3)R30-DEGREES-RB PHASE AT DIFFERENT TEMPERATURES. JOURNAL OF PHYSICS-CONDENSED MATTER, 6 (10). pp. 1869-1880. ISSN 0953-8984.
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Abstract
Normal-incidence standing x-ray wavefield (NISXW) measurements have been made of the local adsorption site of Rb on Al(111) surfaces, particularly in an ordered (square-root 3 x square-root 3)R30-degrees phase, as a function of the sample temperature during adsorption or subsequent annealing. The results confirm the atop-site occupation for low-temperature (around 150 K) preparation, but show that room-temperature preparation leads to a structure having Rb atoms in surface substitutional sites. The overall structural situation is therefore essentially the same as that found previously by low-energy electron diffraction LEED for the Al(111)(square-root 3 x square-root 3)R30-degrees phases. However, experiments involving annealing of the low-temperature prepared surface to room temperature indicate that only a small part of the surface easily transforms to the higher-temperature form, and indeed there is evidence that even in room-temperature preparations some fraction of the adsorbed atoms may remain in atop sites. The apparent conflict of this result with that from recent photoemission core-level shift and LEED data is discussed.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | JOURNAL OF PHYSICS-CONDENSED MATTER | ||||
Publisher: | IOP PUBLISHING LTD | ||||
ISSN: | 0953-8984 | ||||
Official Date: | 7 March 1994 | ||||
Dates: |
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Volume: | 6 | ||||
Number: | 10 | ||||
Number of Pages: | 12 | ||||
Page Range: | pp. 1869-1880 | ||||
Publication Status: | Published |
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