Top-site adsorption for K on Cu(111) and Ni(111) surfaces

Journal Article · Wed Dec 15 04:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.17445· OSTI ID:5552422

Adler, D L ^[1]; Collins, I R ^[2]; Liang, X ^[3]; Murray, S J ^[4]; Leatherman, G S ^[3]; Tsuei, K ^[5]; Chaban, E E ^[1]; Chandavarkar, S ^[6]

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1. AT T Bell Laboratories, Murray Hill, New Jersey 07974 (United States)
2. Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802 (United States) Interdisciplinary Research Center in Surface Science and Department of Physics, Liverpool University, L69 3BX (United Kingdom)
3. Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
4. Interdisciplinary Research Center in Surface Science and Department of Physics, Liverpool University, L69 3BX (United Kingdom)
5. Department of Physics, Brookhaven National Laboratory, Upton, New York 11973 (United States)
6. Fundamenteel Onderzoek de Materie (FOM) Institute for Atomi

Surface-extended x-ray-absorption fine-structure (SEXAFS) measurements have been obtained from [ital p](2[times]2) overlayers of K on Ni(111) and Cu(111) surfaces. The data show that at 65--70 K, potassium occupies the atop site on both substrates, with chemisorption bond lengths of 2.92[plus minus]0.02 A on Ni and 3.05[plus minus]0.02 A on Cu. The identical adsorption site and small change in bond length, only slightly larger than that predicted from the difference in Cu and Ni lattice constants, are consistent with the expected dominance of adatom-adatom interactions in these near-saturation metallic adlayers. The inability to obtain SEXAFS data from K at lower coverages on these surfaces and at these temperatures, indicative of disorder/multisite occupation, is further evidence of a relatively weak alkali-metal substrate interaction even in the dilute-adatom, nonmetallic-overlayer regime.

• OSTI ID: 5552422
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:23; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALKALI METALS
BOND LENGTHS
CHEMICAL REACTIONS
CHEMISORPTION
COPPER
DIMENSIONS
ELEMENTS
EPITAXY
LATTICE PARAMETERS
LENGTH
METALS
NICKEL
POTASSIUM
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TRANSITION ELEMENTS