Structural rearrangements in the C/W(001) surface system

Journal Article · Mon May 15 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.51.13623· OSTI ID:69464

Lyman, P F; Mullins, D R ^[1]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6201 (United States)

We have investigated the surface structure of the C/W(001) surface system at submonolayer C coverages using Auger-electron spectroscopy and high-resolution core-level photoelectron spectroscopy. Core-level spectroscopy is a sensitive probe of an atom`s local electronic environment; by examining the core levels of the W atoms in the selvedge region, we monitored the response of the substrate to C adsorption. The average shift of the 4{ital f} core-level binding energy provided evidence for a heretofore unknown surface reconstruction that occurs upon submonolayer C adsorption. We also performed line-shape analysis on these core-level spectra, and have thereby elucidated the mechanism by which the low-coverage ({radical}2 {times} {radical}2 ){ital R}45{degree} structure evolves to a {ital c}(3 {radical}2 {times} {radical}2 ){ital R}45{degree} arrangement upon further C adsorption. The line-shape analysis also provides corroborating evidence for a proposed model of the saturated C/W(001)-(5{times}1) surface structure, and suggests that the first two or three atomic W layers are perturbed by the C adsorption and attendant reconstruction.

• Research Organization: Oak Ridge National Laboratory
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 69464
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 19 Vol. 51; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
ADSORPTION
AUGER ELECTRON SPECTROSCOPY
CARBON
ELECTRONIC STRUCTURE
PHOTOELECTRON SPECTROSCOPY
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TUNGSTEN