Étude par del de l'interaction de l'oxygène avec les faces (110), (100) et (111) de monocristaux de cuivre

Oustry, A.; Lafourcade, L.; Escaut, A.

doi:10.1016/0039-6028(73)90143-x

Cited by 50 publications

(5 citation statements)

References 8 publications

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“…[6][7][8] Because the high coordination of the closely packed Cu(111) face makes it stable, it is anticipated that the reactivity of gaseous O 2 is lower on (111) than on open (001) and (110). 9 The dissociative adsorption of O 2 on Cu(111) is accompanied by complex reconstructions, and thus, the O-induced surface structures and the surface oxide formation processes on Cu(111) remain controversial.…”

Section: Introductionmentioning

confidence: 99%

“…These applications have motivated us to study O-induced reconstructions on the low-index faces of Cu. The oxidation of Cu(111) is not well understood, although numerous experimental – and theoretical – studies have been devoted to this topic. On Cu(111), an O 2 molecule adsorbs dissociatively at room temperature (RT). – Because the high coordination of the closely packed Cu(111) face makes it stable, it is anticipated that the reactivity of gaseous O 2 is lower on (111) than on open (001) and (110) .…”

Section: Introductionmentioning

confidence: 99%

“…The oxidation of Cu(111) is not well understood, although numerous experimental – and theoretical – studies have been devoted to this topic. On Cu(111), an O 2 molecule adsorbs dissociatively at room temperature (RT). – Because the high coordination of the closely packed Cu(111) face makes it stable, it is anticipated that the reactivity of gaseous O 2 is lower on (111) than on open (001) and (110) . The dissociative adsorption of O 2 on Cu(111) is accompanied by complex reconstructions, and thus, the O-induced surface structures and the surface oxide formation processes on Cu(111) remain controversial.…”

Section: Introductionmentioning

confidence: 99%

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Reconstruction of Cu(111) Induced by a Hyperthermal Oxygen Molecular Beam

et al. 2008

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This paper reports a study on the surface reconstruction on Cu(111) induced by a hyperthermal oxygen molecular beam (HOMB) at room temperature (RT). HOMB incidence at translational energies (E i ) g 0.5 eV induced surface reconstruction to the | -1 3 2 2 | structure for an O coverage (Θ) g 0.27 monolayer (ML). On the other hand, long-range-ordered structures were not formed even at Θ ≈ 0.4 ML for the backfilling of thermal O 2 at RT. No surface reconstruction was induced at E i e 0.23 eV where the attainable Θ value was 0.27 ML for the O 2 exposures below 10 18 molecules/cm 2 . Translational energy above 0.5 eV is required for the dissociative adsorption of O 2 and the resulting surface reconstruction at Θ g 0.27 ML. The O-1s XPS peak for HOMB incidence at RT was resolved into two components, 529.4 and 528.9 eV, at Θ g 0.27 ML, which can be assigned to the O atoms occupying the three-fold hollow sites on unreconstructed Cu(111) and four-coordinated sites on the | -1 3 2 2 | structure, respectively. Annealing the | -1 3 2 2 | reconstructed surface at 620 K decreased Θ to ∼0.27 ML and induced (√13R46.1°× 7R21.8°), the so-called "29" superstructure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reconstruction of Cu(111) Induced by a Hyperthermal Oxygen Molecular Beam

et al. 2008

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“…Information on the chemisorption phases has been provided by a range of techniques including LEED (5)(6)(7)(8)(9)(10)(11)(12)(13)(14), X-ray photoelectron spectroscopy (XPS) (IS), work functionmeasurements (10, 1 l), ion scattering (16,17), secondary ion mass spectrometry (18), high-resolution electron energy loss spectroscopy (19,20), photoelectron diffraction (21), and surface extended X-ray absorption fine structure (SEXAFS) (22). Several studies have suggested that oxygen enetrates below the top copper 4 layer, especially for the (2 2 X V5)45" surface (6,8,10,11 3 but other evidence has pointed to the ( f i x V5)45" and (2 2 x V5)45" surfaces as having related structures (12,21).…”

Section: Introductionmentioning

confidence: 99%

LEED crystallographic studies for the chemisorption of oxygen on the (100) surface of copper

Zeng¹,

McFarlane²,

Sodhi³

et al. 1988

Can. J. Chem.

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. Can. J. Chem. 66, 2054Chem. 66, (1988. Intensity analyses with low-energy electron diffraction (LEED) are reported for surface structures obtained by adsorbing submonolayer amounts of oxygen on the (100) surface of copper. It is found for chemisorption on the four-coordinate hollow sites that the correspondence between experimental and calculated intensity-versus-energy curves, for 10 diffracted beams, is slightly better for coplanar adsorption than for adsorption about 0.75 A above the surface (the latter model is essentially as proposed previously by both SEXAFS and photoelectron diffraction). Nevertheless, in neither of these contrasting situations is the agreement sufficient to conclude that the structural analysis is complete. Evidence is presented that nearly coplanar chemisorption, in combination with a missing row model, can accommodate a number of structural features for this system, including the existence of the ( 2 d 2 x d2)45"-0 phase, beam splittings resulting from antiphase domain boundaries, and the structural analogy noted in other studies between the ( 2 d 2 x d2)45"-0 phase and the stepped nature of the (410) copper surface which can form by faceting in oxygen. Considerations of 0-Cu surface bond lengths, guided by those in bulk Cu20, suggest that additional lateral relaxations are likely in the topmost copper layer. This study provides no support for the 0 chemisorption occumng in tetrahedral-type sites. On a effectut les analyses d'intensitt de diffractions ilectronique de basse Cnergie (DEBE) pour des structures de surface obtenues par l'adsorption de quantitts ne correspondant pas a des monocouches d'oxygtne sur la surface (100) du cuivre. Pour la chemisorption sur les sites vides de coordination-4, examinte a l'aide de 10 faisceaux de diffraction, on a trouvt que la correspondance entre les courbes expirimentales et les courbes calcultes de l'intensitt vs 1'Cnergie est ltgtrement meilleure pour I'adsorption coplanaire que pour l'adsorption environ 0,75 A au-dessus de la surface (ce dernier modtle est essentiellement celui qui avait it6 proposC anttrieurement tant par SEXAFS que par diffraction Clectronique). Toutefois, ni I'une ni l'autre de ces situations pourtant trts difftrentes ne conduit une concordance suffisante pour conclure que l'analyse de structure est complete. On prtsente des donntes suggtrant que de la chemisorption coplanaire, combinCe avec un modkle impliquant une couche manquante peut accommoder un certain nombre de caractCristiques de structure de ce systkme, y compris l'existence de la phase ( 2 d 2 x d2)45"-0 ainsi que la nature en escalier de la surface (410) du cuivre qui peut se former lorsqu'elle est facettie dans de l'oxygtne. Des considtrations concernant les longueurs des liaisons Cu-0 de surface, basCes sur celles que l'on retrouve dans du Cu20, suggtrent que les relaxations lattrales additionnelles sont probables dans la couche supCrieure du cuivre. Cette ttude ne fournit accun support pour l'hypothtse selon laquelle la chemisorption des 0 se fait sur des ...

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“…The adsorption of oxygen at pressures between 10-8-10 -4 Torr on Cu(110) has already been investigated with LEED [1][2][3][4], work function measurements [5] and ellipsometry combined with AES [6]. Some aspects of the adsorption of oxygen on Cu(110) surfaces were also studied with low energy ion scattering (LEIS).…”

Section: Introductionmentioning

confidence: 99%

The influence of low energy ion beams on an adsorbing surface

Wit

Fluit

Hupkens

et al. 1980

Nuclear Instruments and Methods

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Strong enhancement of the oxygen-chemisorption at a Cu(110) surface is measured during low energy (some keV)noble gas (Ne +) ion bombardment. This phenomenon is independent of the coverage and is linearly related to the number of impinging ions per second. A model description of the oxygen adsorption on a Cu(110) surface is given: the model of dissociative adsorption via a mobile precursor state is extended to take into account the twofold symmetry of the surface. From a comparison of model calculations with the experimental results, model parameters can be estimated. The estimated parameters are in agreement with the adsorbate-structure deduced from LEED patterns. Ion-induced adsorption is discussed with the aid of this model.

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Étude par del de l'interaction de l'oxygène avec les faces (110), (100) et (111) de monocristaux de cuivre

Cited by 50 publications

References 8 publications

Reconstruction of Cu(111) Induced by a Hyperthermal Oxygen Molecular Beam

Reconstruction of Cu(111) Induced by a Hyperthermal Oxygen Molecular Beam

LEED crystallographic studies for the chemisorption of oxygen on the (100) surface of copper

The influence of low energy ion beams on an adsorbing surface

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