Oxygen adsorption on Cu(10): Determination of atom positions with low energy ion scattering

Wit, A.G.J. De; Bronckers, R.P.N.; Fluit, J.M.

doi:10.1016/0039-6028(79)90326-1

Cited by 114 publications

(16 citation statements)

References 16 publications

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“…The increase in work function up to OS monolayers at low oxygen exposure indicates simple chemisorption without reconstruction or incorporation. This result is in agreement with a recent low-energy ion scattering study [13]. Analogous to the situation in the oxygen/Cu(lOO) system [8] the reversal of the direction of the work function change in stage B appears to indicate some degree of incorporation into the sub-surface region.…”

Section: Discussionsupporting

confidence: 90%

“…This may indicate that the c(6 X 2) structure is a co-incidence site lattice where certain oxygen atoms in the unit cell can penetrate somewhat further into the surface than is the case for the (2 X 1) structure. According to De Wit et al [13] the most likely sites for the latter are the "long bridges". If in the c(6 X 2) structure some oxygen atoms are adsorbed in deeper Bs sites [ 141 due to a re-distri-bution along the [ilO] direction, then a decrease in net work function might result.…”

Section: Discussionmentioning

confidence: 99%

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The adsorption and incorporation of oxygen on Cu(110) and its reaction with carbon monoxide

et al. 1979

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The initial interaction of oxygen with a Cu(ll0) surface occurs in two stages, character&d by (2 X 1) and ~$6 X 2) overlayer structures and then a third stage where the cf6 X 2) structure remains but further oxygen uptake is registered only with e~psometry. The fust stage is nonactivated and is accornp~~~ by a work function increase of 370-420 meV, depending on sample temperature. The subsequent appearance of the extra features associated with the c(6 X 2) structure in the second stage is accompanied by a decrease in work function of -100 meV and is characterised by an apparent activation energy of -18 M mol-r . The adsorbed oxygen can be removed at all coverages by gas-phase CO. The reaction appears to foHOw Langmuir-Hiishelwood kinetics with an apparent activation energy of -25 M mol-' . fntroductionThe interaction of oxygen with the (110) surface of copper results in the initial formation of a (2 X 1) surface structure which is assumed to correspond to 0.5 monolayers [l--4]. Further oxygen exposure produces a ~(6 X 2) structure f5]. The first stage of the interaction is known to be accompanied by an increase in work function. Thus Ertl and Kiippers [6] have reported an increase of 0.2 eV after an exposure of 6 L and Delchar f7] a m~~urn increase of 0.67 eV after 2 X 10" L at room temperature. Delchar established that a change of 0.40 eV had already been reached after about 100 L. On the (100) surface a similar reaction sequence has been observed. The formation of the initial (u/z X 42) R45" structure is accompanied by an increase in the work function as might be expected, but the formation of the subsequent (d2 X 242) R4.5" structure by a decrease [8,9]. This has been 285

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

The adsorption and incorporation of oxygen on Cu(110) and its reaction with carbon monoxide

et al. 1979

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“…The (2 X 1) LEED pattern at the saturation point of the chemisorption stage permits an absolute calibration of the coverage. Assuming that no reconstruction takes place during exposures in the 10 -6 Torr min range [8] we conclude that the (2 X 1) pattern corresponds to f3 = 0.5. Thus for the chemisorption stage on Cu(ll0) e = (1.25 ~O.l5)Xh&z~" (la)…”

Section: J2 Calibrationmentioning

confidence: 77%

“…6 a plot is shown of the sticking probability as a function of the oxygen coverage at room temperature. The initial sticking probab~ity is about 0. ordered (2 X 1) pattern, while no restructuring of the Cu surface takes place [8], points to lateral interactions in the adsorbed layer. When two empty adjacent sites are necessary for dissociation, then the lateral interactions have to be taken into account in the model for the kinetics.…”

Section: Discussion Of the O2 Adsorptionmentioning

confidence: 94%

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The kinetics of the interactions of O2 and N20 with a Cu(110) surface and of the reaction of CO with adsorbed oxygen studied by means of ellipsometry, AES and LEED

1979

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Ellipsometry, LEED and Auger electron spectroscopy have been used to study the interactions of Oa and NzO with a clean annealed Cu(ll0) surface and the reaction of CO with adsorbed oxygen in the monolayer range. Gas pressures were in the range 1O-8-1O-4 Torr and crystal temperatures varied between 23-4OO'C. The changes in the ellipsometric angles A and $I per oxygen atom upon adsorption and removal of oxygen depend on the coverage 0, the temperature and on the azimuth of the plane of incidence of the light beam. The kinetics of the chemisorption of oxygen is independent of the crystal temperature, initial sticking probabiiity ~0.2. The LEED data and the adsorption kinetics indicate an attractive interaction in the adsorbed layer in the [OOl] direction. The initial decomposition probabi~~y of NaO at room temperature is 0.15 and decreases with increasing temperature; the maximum coverage is 0.5 monolayer. The LEED patterns observed were the same as those with 0s. The reaction probability of CO with adsorbed oxygen increases with decreasing oxygen coverage (order of mag nitude -1O-5, apparent activation energy -6 kcaI/mol). This increase has been attributed to the operation of the Langmuir-Hinshelwood mechanism.

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Ion–solid interaction at low energies: Principles and application of quantitative ISS

Niehus

Spitzl

1991

Surface & Interface Analysis

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Quantitative surface analysis with low-energy (500-5000 ev) ion scattering spectroscopy is known to be difficult, most often because of strong charge transfer and multiple scattering effects occurring during ion-surface interaction. In order to avoid neutralization problems, either alkali primary ions or noble gas ions in combination with the detection of all scattered particles was applied Multiple scattering occurs predominantly at forward scattering and might confound the analysis. Backward scattering (ie. 1800 impact coWi ion scattering) bypasses strongly the multiple scattering complication and has been 4 successfdy for the analysis of a number of surfaee structures for metals, semiconductors and binary aUoys. A simple triangulation concept gives access to mass-sektive qualitative surface crystallography. Quantitative surface structures were determined by comparison with computer simulations.

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Oxygen adsorption on Cu(10): Determination of atom positions with low energy ion scattering

Cited by 114 publications

References 16 publications

The adsorption and incorporation of oxygen on Cu(110) and its reaction with carbon monoxide

The adsorption and incorporation of oxygen on Cu(110) and its reaction with carbon monoxide

The kinetics of the interactions of O2 and N20 with a Cu(110) surface and of the reaction of CO with adsorbed oxygen studied by means of ellipsometry, AES and LEED

Ion–solid interaction at low energies: Principles and application of quantitative ISS

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