Crossref journal-article
The Royal Society
Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences (175)
Abstract

The interaction of oxygen and nitric oxide with clean aluminium surfaces has been investigated by X-ray photoelectron spectroscopy. Studies have been in the main confined to the temperature range 80–290 K and pressure range 10 -6 –10 -2 Pa. The Al(2p) level is shown to exhibit a shifted component at a binding energy of ~ 74.5 eV after oxygen interaction at 80 K. A curve-fitting and deconvolution analysis of the shifted peak indicates that it is made up of two components, one at a binding energy of 74.0 eV and the other at 75.3 eV. The lower binding energy component (designated α ) develops preferentially at 80 K while the higher binding energy one ( β ), assigned to Al 2 O 3 , is dominant at 290 K. We suggest that α is an incorporated oxygen structure which is a precursor to the formation of Al 2 O 3 . The initial sticking probability of oxygen at 80 K is 0.07 while at 290 K it is 0.02. The plasmon-loss features associated with the Al(2s) peak are shown to be sensitive to oxygen adsorption and therefore useful in confirming the surface monolayer. At 290 K and an oxygen pressure of 10 4 Pa the oxide thickness is estimated to be about 0.9 nm. When NO was adsorbed at 80 K three distinct N(1s) peaks were observed at binding energies of about 397, 403 and 407 eV. We assign the 397 eV peak to N δ- ads arising from dissociation of the molecule and the two higher binding energy peaks to N δ- ads and N 2 O ads . The N(1s) peak characteristic of NO δ- ads is close to the lower binding energy peak of the two N(1s) peaks associated with N 2 O ads while the O(1s) of NO δ- ads overlaps with the O(1s) peak of the surface oxide at a binding energy of about 532 eV. Mass spectroscopic analysis of the gas phase indicated that on warming to 85 K, the adlayer formed at 80 K, N 2 O was desorbed, confirming our assignment of the core-level spectra. The NO δ- and N 2 O species are not observed at 290 K while at 80 K exposure of the adlayer to water vapour results in the complete removal of weakly adsorbed N 2 O. By monitoring the intensities of the Al(2p), N(1s) and O(1s) peaks, estimates were made of the absolute and relative concentrations of the various species and various molecular processes delineated.

Bibliography

An X-ray photoelectron spectroscopic study of the interaction of oxygen and nitric oxide with aluminium. (1978). Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 363(1714), 403–424.

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Dates
Type When
Created 18 years, 8 months ago (Dec. 18, 2006, 5:35 p.m.)
Deposited 4 years, 6 months ago (Feb. 20, 2021, 11:58 p.m.)
Indexed 3 weeks, 6 days ago (Aug. 6, 2025, 9:44 a.m.)
Issued 46 years, 9 months ago (Nov. 22, 1978)
Published 46 years, 9 months ago (Nov. 22, 1978)
Published Online 28 years, 8 months ago (Jan. 1, 1997)
Published Print 46 years, 9 months ago (Nov. 22, 1978)
Funders 0

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@article{1978, volume={363}, ISSN={0080-4630}, url={http://dx.doi.org/10.1098/rspa.1978.0175}, DOI={10.1098/rspa.1978.0175}, number={1714}, journal={Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences}, publisher={The Royal Society}, year={1978}, month=nov, pages={403–424} }