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Species formed at cuprite fracture surfaces; observation of O 1s surface core level shift by Sarah L. Harmer; William M. Skinner; Alan N. Buckley; Liang-Jen Fan is a Physics and Astronomy article available to read on EtoBox.

What is Species formed at cuprite fracture surfaces; observation of O 1s surface core level shift about?

Surfaces of mineral cuprite prepared by fracture under UHV have been characterised by synchrotron XPS and near-edge X-ray absorption spectroscopy before and after exposure to ambient air. Before exposure of the cuprite, the Cu 2p photoelectron and Cu L 2,3 -edge absorption spectra were consistent with Cu I with very little d 9 character. Surface-enhanced O 1s spectra from the unexposed mineral revealed a surface species, with binding energy 0.95 ± 0.05 eV below the principal cuprous oxide peak, assigned to undercoordinated oxygen. A second surface species, with binding energy about 1 eV higher than the principal peak, was assigned to either hydroxyl derived from chemisorbed water vapour or surface oxygen dimers produced by restructuring of the cuprite fracture surface. The width of the principal O 1s peak was 0.66 ± 0.02 eV. The observed Cu L 3 -and O K-edge absorption spectra were in good agreement with those simulated for the cuprite structure. After exposure of the fracture surface to ambient air, the low binding energy O 1s surface species was barely discernible, the original high binding energy O 1s surface species remained of comparable intensity, new intensity appeared at an

Who reads Species formed at cuprite fracture surfaces; observation of O 1s surface core level shift?

Author

Sarah L. Harmer; William M. Skinner; Alan N. Buckley; Liang-Jen Fan

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0039-6028)

Published

2009

Language

EN

Field

Physics and Astronomy (Physical Sciences)