Enhanced surface vibrations and reconstruction of the Al(111) surface induced by Rb adsorption

Martin Meedom Nielsen, J. Burchhardt, D.L. Adams, E. Lundgren, J.N. Andersen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The bond geometries of Rb atoms in two different (square-root 3 x square-root 3)R30-degrees structures, formed by adsorption on Al(111) at 100 and 300 K, have been determined by low energy electron diffraction. Adsorption at 300 K leads to occupation by Rb atoms of a quasisubstitutional, sixfold coordinate site formed by displacing every third Al atom in the first layer of the substrate. Adsorption at 100 K leads to occupation of an on-top site on a rumpled Al layer in which the vibrational amplitudes of Al atoms are anomalously large. An irreversible, order-preserving phase transition from the 100 K to the 300 K structure occurs on annealing.
Original languageEnglish
JournalPhysical Review Letters
Volume72
Issue number21
Pages (from-to)3370-3373
ISSN0031-9007
DOIs
Publication statusPublished - 1994
Externally publishedYes

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