An STM study of the oxidation of Mg()

Goonewardene, Anura; Karunamuni, J.; Kurtz, Richard L.; Stockbauer, Roger

doi:10.1016/s0039-6028(01)01814-3

Cited by 21 publications

(14 citation statements)

References 16 publications

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“…We assign these structures to local areas of oxidized Be(0001) for several reasons. Similar structures were reported from metal surfaces exposed to O 2 at room temperature, i.e., Pt(111), 45 Cr(110), 46 Mg(0001), 47 and Pt(110). 48 Further, increasing the exposure of Be(0001) to O 2 leads to an increased amount of islands that partly coalesce and thus increase the coverage of the observed structures.…”

Section: A Oxygen Vibrationssupporting

confidence: 76%

Oxygen vibrations and acoustic surface plasmon on Be(0001)

et al. 2012

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Spectroscopic signatures of vibrational excitations on initially oxidized Be(0001) are identified by a combination of electron energy loss spectroscopy and density functional calculations. Prominent spectral features are due to vibrations in a Be-O mixing layer. Scanning tunneling microscopy indicates that initial oxidation occurs locally in the form of islands. The acoustic surface plasmon persists on the oxygen-covered surface. Its dispersion has been determined along the¯ K direction and is virtually identical to the dispersion of the acoustic surface plasmon of the clean surface.

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Section: A Oxygen Vibrationssupporting

confidence: 76%

Oxygen vibrations and acoustic surface plasmon on Be(0001)

et al. 2012

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“…1(b), the reaction probability is initially low, but increases rapidly with increasing oxygen coverage. This behavior has been observed for oxygen interacting with various metal surfaces and was attributed to oxide island nucleation and growth [15][16][17][18]. After passing the current maximum, the reaction rate drops exponentially due to saturation of reaction sites.…”

mentioning

confidence: 65%

Continuous Monitoring of Mg Oxidation by Internal Exoemission

Glass

Nienhaus

2004

Phys. Rev. Lett.

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Thin-film Mg/Si(111) Schottky diodes are exposed to oxygen to detect chemicurrents in the devices. The detected charge is created by nonadiabatic energy dissipation and due to either internal exoemission currents or surface chemiluminescence induced photocurrents. Both contributions can be distinguished by changing the metal film thickness of the device. Auger electron spectroscopy to study the oxygen uptake demonstrates that the chemicurrent transients represent truly the time dependent reaction rate at the surface. Model calculations indicate that the current monitors Mg oxide island nucleation and growth.

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“…10 This is in agreement with a more direct experimental evidence for oxygen incorporation in the octahedral interstitial sites of the first two interlayer spacings of Mg during the initial stages of magnesium oxidation, 11 and with later inelastic ion scattering experiments on a polycrystalline Mg surface. 14,15 A recent scanning tunneling microscopy ͑STM͒ study of the oxidation of Mg͑0001͒ suggests that at low oxygen exposures ͑up to 2 L͒ the incorporated oxygen atoms form a single layer underneath the top layer of Mg. 5 The idea of immediately populated subsurface sites seems also to be supported by recent measurements by Mitrovic et al, 12 however, they show that most of the oxygen ͑90%͒ remains over the surface and only a small fraction goes below the surface. Thus, the question regarding the most favored adsorption sites is still debated and requires further analysis.…”

Section: Introductionmentioning

confidence: 74%

“…2 Magnesium oxide is known to eventually form crystals of the rocksalt structure, 3 but can also experience complex reconstructions at partial coverages. 4,5 Both Mg and Al oxides play an important role in catalyst support and find many other useful applications.…”

Section: Introductionmentioning

confidence: 99%

O adsorption and incipient oxidation of the Mg(0001) surface

2004

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First principles density functional calculations are used to study the early oxidation stages of the Mg(0001) surface for oxygen coverages 1/16 <= Theta <= 3 monolayers. It is found that at very low coverages O is incorporated below the topmost Mg layer in tetrahedral sites. At higher oxygen-load the binding in on-surface sites is increased but at one monolayer coverage the on-surface binding is still about 60 meV weaker than for subsurface sites. The subsurface octahedral sites are found to be unfavorable compared to subsurface tetrahedral sites and to on-surface sites. At higher coverages oxygen adsorbs both under the surface and up. Our calculations predict island formation and clustering of incorporated and adsorbed oxygen in agreement with previous calculations. The calculated configurations are compared with the angle-scanned x-ray photoelectron diffraction experiment to determine the geometrical structure of the oxidized Mg(0001) surface.Comment: 10 pages, 5 figure

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An STM study of the oxidation of Mg()

Cited by 21 publications

References 16 publications

Oxygen vibrations and acoustic surface plasmon on Be(0001)

Oxygen vibrations and acoustic surface plasmon on Be(0001)

Continuous Monitoring of Mg Oxidation by Internal Exoemission

O adsorption and incipient oxidation of the Mg(0001) surface

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