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 language | English |
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Journal | Physical Review B |
Volume | 46 |
Issue number | 23 |
Pages (from-to) | 15594-15597 |
ISSN | 2469-9950 |
DOIs | |
Publication status | Published - 1992 |
Externally published | Yes |