Excitation spectra of incommensurate Li chains on a Cu(100) surface

• Published in: Surface science Vol. 363; no. 1; pp. 331 - 336
• Main Authors: Yagi, Y., Kakitani, K., Yoshimori, A.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 01.08.1996; Amsterdam Elsevier Science; New York, NY
• Subjects: Alkali metals; Applied sciences; Condensed matter: structure, mechanical and thermal properties; Copper; Electron energy loss spectroscopy; Exact sciences and technology; Low index single crystal surfaces; Metals. Metallurgy; Molecular dynamics; Physics; Solid surfaces and solid-solid interfaces; Surface and interface dynamics and vibrations; Surface relaxation and reconstruction; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Vibrations of adsorbed molecules; Surface relaxation and reconstruction; Vibrations of adsorbed molecules; Low index single crystal surfaces; Alkali metals; Molecular dynamics; Copper; Electron energy loss spectroscopy; Incommensurate phases; Temperature effects; Transition elements; Molecular dynamics calculations; Theoretical study; Adsorption structure; Lithium; Anharmonicity; Lattice vibrations; Surface structure
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/0039-6028(96)00157-4

According to low energy electron diffraction (LEED) measurements, Li atoms form linear incommensurate chains in the missing rows induced by Li adsorption on a Cu(100) surface at room temperature and in the coverage range from 0.375 to 0.4. The motions of these Li atoms in the chains are discussed by the classical molecular dynamics calculation. The vibrational excitation spectra of this system are also calculated. Li atoms are assumed to move not only parallel to the surface but also perpendicular to the surface in the missing row by the periodic potential from the substrate Cu atoms. This situation is treated in an approximate manner to show that the spectra obtained may be observed by spectroscopy measurements such as those made by high resolution electron energy loss spectroscopy.