STRUCTURE OF THE QUASI-HEXAGONAL CLOSE-PACKED (4-X-4) NA LAYER ON AL(111) - A SEXAFS STUDY

Authors
SCHMALZ A AMINPIROOZ S HAASE J BATCHELOR DR NIELSEN MM BOGH E ADAMS DL
Citation
A. Schmalz et al., STRUCTURE OF THE QUASI-HEXAGONAL CLOSE-PACKED (4-X-4) NA LAYER ON AL(111) - A SEXAFS STUDY, Surface science, 301(1-3), 1994, pp. 120000211-120000216
Citations number
14
Categorie Soggetti
Chemistry Physical
Journal title
Surface science → ACNP
ISSN journal
00396028
Volume
301
Issue
1-3
Year of publication
1994
Pages
120000211 - 120000216
Database
ISI
SICI code
0039-6028(1994)301:1-3<120000211:SOTQC(>2.0.ZU;2-#
Abstract
The Al(111)-(4x4)-Na structure formed by adsorption of Na on Al(111) a t low temperature is studied by surface extended X-ray absorption fine structure (SEXAFS). Analysis of the SEXAFS measurements shows that th e adsorbed layer is quasihexagonal close-packed and slightly compresse d, with a nearest-neighbour Na-Na bond length of 3.70+/-0.03 Angstrom. Na atoms are adsorbed in 3 different adsorption sites with roughly eq ual Na-Al bond lengths of 2.8 Angstrom but different perpendicular dis tances from the surface. Thus the Na layer is not strictly planar.