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

Carley, Albert Frederick, Davies, Philip Rosser ORCID: https://orcid.org/0000-0003-4394-766X, 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:	05 Aug 2023 01:27
URI:	https://orca.cardiff.ac.uk/id/eprint/10396

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