Core-level spectroscopy of the Pd/W(110) interface: Evidence of long-range Pd-island-W interactions at submonolayer Pd coverages

SURFACE SCIENCE

卷:603

Article

Riffe, D. M.¹  Shinn, N. D.²  Kim, B.^3,4  Kim, K. J.⁵  Kang, T. -H.⁴ 

[1] Utah State Univ, Dept Phys, Logan, UT 84322 USA

[2] Sandia Natl Labs, Albuquerque, NM 87185 USA

[3] POSTECH, Dept Phys, Pohang 790784, Kyungbuk, South Korea

[4] Pohang Accelerator Lab, Beamline Res Div, Pohang 790784, Kyungbuk, South Korea

[5] Konkuk Univ, Dept Phys, Seoul 143701, South Korea

关键词: Bimetallic surfaces;    Palladium;    Soft X-ray photoelectron spectroscopy;    Surface electronic structure;    Tungsten;   

DOI  :  10.1016/j.susc.2009.02.026

来源: Elsevier

【 摘 要 】

We have measured W 4f(7/2) core-level photoemission spectra from W(110) in the presence of Pd overlayers for coverages up to similar to 1 pseudomorphic monolayer (ML). At coverages close to 0.05 ML a striking change in the W core-level spectrum is observed, which we interpret as indicating a long-range lateral effect of 2D Pd islands upon the W electronic structure in both the first and second W layers. As the coverage increases the long-range effect weakens and finally vanishes near 0.85 ML Above this coverage the W spectra are typical for a W-based bimetallic interface, with the first-layer W atoms exhibiting a small interfacial core-level shift (-95 +/- 5 meV) compared to the bulk atoms. (C) 2009 Elsevier B.V. All rights reserved.

【 授权许可】

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