Na and K on Al(100) studied by low-energy electron diffraction and high-resolution core-level spectroscopy
Date of Original Version
Experimental results for Na and K deposited at 100 K on the A1(100) surface using low-energy electron diffraction and high-resolution core-level spectroscopy are presented. Our results show that from a coverage of 0.20 monolayers (ML), Na condenses into dense islands with a local Na coverage of 0.50 ML. In the case of K, the overlayer condenses into islands at a coverage of 0.18 ML, with a local coverage of 0.30 ML. A compilation of various geometric parameters of the present systems and of alkalis on Al(111) suggests that the condensation of K on Al(100) differs from that of other alkalis on Al systems which undergo condensation into two-dimensional islands. Furthermore, all the island-forming structures display an alkali-alkali distance which is expanded relative to the nearest-neighbour distance in the respective alkali metal. The reasons for and implications of this are discussed.
Publication Title, e.g., Journal
Lundgren, E., A. Beutler, R. Nyholm, J. N. Andersen, and D. Heskett. "Na and K on Al(100) studied by low-energy electron diffraction and high-resolution core-level spectroscopy." Surface Science 370, 2-3 (1997): 311-323. doi: 10.1016/S0039-6028(96)00957-0.