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
Subjects:	Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF PHYSICS-CONDENSED MATTER
Publisher:	IOP PUBLISHING LTD
ISSN:	0953-8984
Date:	7 March 1994
Volume:	6
Number:	10
Number of Pages:	12
Page Range:	pp. 1869-1880
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/20772

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