Valence state of low-dimensional thulium structures grown on molybdenum (110)

• Published in: Surface science Vol. 307; pp. 858 - 862
• Main Authors: Nicklin, C.L., Binns, C., Norris, C., Alleno, E., Barthes-Labrousse, M.-G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 20.04.1994; Amsterdam Elsevier Science; New York, NY
• Subjects: Adsorbed layers and thin films; Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Electron and ion emission by liquids and solids; impact phenomena; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Exact sciences and technology; Impurity and defect levels; energy states of adsorbed species; Lattice dynamics; Metals. Metallurgy; Phonon-electron and phonon-phonon interactions; Phonons and vibrations in crystal lattices; Photoemission and photoelectron spectra; Physics; Surface and interface electron states; Thulium; Valence bands; Ultraviolet radiation; Electronic structure; Valence; Adsorption; Rare earths; Experimental study; Molybdenum; Photoelectron spectroscopy; Synchrotron radiation
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/0039-6028(94)91504-0

Valence band photoemission spectra of well-defined structures of the rare earth Tm deposited onto a Mo(110) surface have been measured using synchrotron radiation. The results correlate with the overlayer structure; mixed valence is observed at low coverages, in areas of island formation and beyond one monolayer. The presence of divalent features is associated with low coordinated sites, which provide insufficient transfer of energy to promote a 4f electron into the valence 5d6s states. This is consistent with theoretical predictions.