Local site identification for NO on Ni(111) in vibrationally distinct adsorption states

Autor:	D. E. Ricken, Karl-Michael Schindler, Agustín R. González-Elipe, José C. Conesa, A.W. Robinson, Peter Gardner, David Phillip Woodruff, Maria C. Asensio, Alexander M. Bradshaw
Rok vydání:	1992
Předmět:	Diffraction Non-blocking I/O Analytical chemistry Infrared spectroscopy chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Oxygen Spectral line Surfaces Coatings and Films Crystallography Nickel Adsorption chemistry Electron diffraction
Zdroj:	Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 10:2445-2450
ISSN:	1520-8559 0734-2101
DOI:	10.1116/1.577982
Popis:	Vibrational spectroscopy of NO on Ni(111) shows two distinct N–O stretching bands for adsorption on the clean surface at different coverages which have been attributed to tilted and perpendicular bridging species at low and high coverage, respectively, while an even higher vibrational energy seen when NO is coadsorbed with oxygen has been attributed to atop NO. We have investigated the local adsorption geometry of these species with scanned energy mode photoelectron diffraction from the N and O 1s states, a method previously found to be very sensitive to site changes and capable of quantitative site identification. We find essentially identical photoelectron diffraction spectra from all three species, indicating that there are no site changes to within a few hundredths of an Angstrom unit. Moreover, a quantitative analysis using double scattering model calculations indicates that in all cases the adsorption site is actually a threefold coordinated hollow and not bridge or atop.
Databáze:	OpenAIRE
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