The adsorption position of Hg on Ni(100): a transmission channeling study

• Published in: Surface science Vol. 310; no. 1; pp. L589 - L594
• Main Authors: Poulsen, P.R., Stensgaard, I., Besenbacher, F.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.05.1994; Amsterdam Elsevier Science; New York, NY
• Subjects: Applied sciences; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Metals. Metallurgy; Physics; Solid surfaces and solid-solid interfaces; Surface structure and topography; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); RBS; Adsorption; Transition elements; Nickel; Coverage rate; Experimental study; Mercury; Surface structure
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/0039-6028(94)91356-0

The adsorption position of Hg on Ni(100) has been studied with transmission channeling. It is shown that for coverages up to 0.5 monolayer (ML), Hg adsorbs in the four-fold hollow site (FFHS) at a height of 2.25 ± 0.10 rA. This is at variance with an earlier report of adsorption in the bridge site. For a crystal temperature of 115 K and low coverage ( θ Hg t 0.18 ML), the two-dimensional vibration amplitude parallel to the surface, ρ Hg, is 0.10 +- 0.03 rA, but at higher coverage, θ Hg ∼ 0.45 ML, there is an apparent increase in the root-mean-square displacement of the Hg atoms from the FFHS. Possible origins of this increase are discussed.