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.
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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) |
@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} }