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Oxygen states at magnesium and copper surfaces revealed by scanning tunneling microscopy and surface reactivity

Carley, Albert Frederick, Davies, Philip Rosser, Harikumar, K. R., Jones, Rhys Vaughan and Roberts, Meirion Wyn 2003. Oxygen states at magnesium and copper surfaces revealed by scanning tunneling microscopy and surface reactivity. Topics in Catalysis 24 (1-4) , pp. 51-59. 10.1023/B:TOCA.0000003076.82649.c4

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Abstract

By a combination of STM and XPS a study of the dynamics of oxygen chemisorption at Mg(0001) at 295 K has revealed oxygen states involving nucleation sites and the development of hexagonal and square lattice structures; the hexagonal structures develop epitaxially with the Mg(0001) surface. There is extensive surface mobility with, at the early stage of chemisorption, oxygen states being observed at steps at the (1 x 1)-O adlayer and overlapping magnesium atoms. These are active in ammonia and hydrocarbon oxidation whereas at higher oxygen coverage the surface is inactive. The dissociative chemisorption of nitric oxide generates a surface characterized by the hexagonal oxide structure; nitrogen adatoms known to be present from the N(Is) spectra are disordered. The chemisorption of hydrogen chloride at a Cu(110) surface results in a c(2 x 2)-Cl structure with at high coverage domains 1.8 nm wide. A sub-surface oxygen state at Cu(110), although unreactive to ammonia, undergoes a chemisorption replacement (corrosive chemisorption) reaction with HCl at 295 K.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: magnesium - copper - scanning tunneling microscopy - X-ray photoelectron spectroscopy - ammonia - oxidation - hydrocarbons
Additional Information: Conference in Honor of Professor Sir John Meurig Thomas, LONDON, ENGLAND, SEP 03-05, 2002
Publisher: Springer
ISSN: 1022-5528
Last Modified: 03 Nov 2017 01:41
URI: http://orca.cf.ac.uk/id/eprint/10396

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