Temperature-dependent local geometries in the system Al(100)-c(2x2)-Na: A surface extended X-ray-absorption fine-structure study

S. Aminpirooz, A. Schmalz, L. Becker, N. Pangher, J. Haase, Martin Meedom Nielsen, D.R. Batchelor, E. Bøgh, D.L. Adams

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The adsorption of Na on Al(100) at 140 and 300 K has been studied by surface extended x-ray-absorption fine-structure experiments. An analysis of the measurements shows that the local geometry in the c (2 X 2)-Na phases formed at each temperature is completely different. At 140 K the Na atoms occupy fourfold hollow sites, whereas at 300 K a model is favored where the Na atoms lie beneath a reconstructed surface Al layer. Warming to 300 K causes an irreversible transformation of the low-temperature structure to the room-temperature structure.
Original languageEnglish
JournalPhysical Review B
Volume46
Issue number23
Pages (from-to)15594-15597
ISSN2469-9950
DOIs
Publication statusPublished - 1992
Externally publishedYes

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