CO adsorbed on MgO(100): a high resolution LEED study

Audibert, P; Sidoumou, M.; Suzanne, J.

doi:10.1016/0039-6028(92)90058-e

Cited by 44 publications

(20 citation statements)

References 13 publications

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“…The main band at 2151 cm −1 was assigned to the dynamic dipole of perpendicular oriented CO molecules adsorbed on regular terrace sites, while the latter two bands were attributed to the in-phase and out-of-phase vibrational excitation of tilted CO, respectively. This assignment is supported by the fact that only the band at 2132 cm −1 is detected with s-polarized light [16] and is in line with previous interpretations of helium atom scattering (HAS) and LEED experiments, where a c(4 × 2) overlayer was observed [17,18]. The characteristic superstructure as well as the two bands for the in-phase and out-of-phase vibrational excitation disappear at temperatures above 40 K giving evidence for dynamical reordering of the CO layer as well as partial desorption of CO molecules.…”

Section: Methodssupporting

confidence: 72%

CO adsorption on the surface of MgO(001) thin films

Sterrer¹,

Risse²,

Freund³

2006

Applied Catalysis A: General

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We report infrared reflection-absorption and thermal desorption spectra of CO adsorbed at low temperature (30 K) on the surface of MgO(001) thin films. The high similarity of the observed IR bands as compared to data reported for MgO(100) single crystals and sintered MgO particles gives evidence for the identical surface morphology of the different substrates. CO adsorption series taken at constant temperature/ variable pressure, variable temperature/constant pressure, as well as isotope mixing experiments reveal almost no diffusion of CO on MgO(001) at low temperature, but high adsorbate mobility at slightly elevated temperature.

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Section: Methodssupporting

confidence: 72%

CO adsorption on the surface of MgO(001) thin films

Sterrer¹,

Risse²,

Freund³

2006

Applied Catalysis A: General

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“…Low energy electron diffraction 1,2 ͑LEED͒ and thermal helium atom scattering 3 ͑HAS͒ experiments agree that the stable ͑sub-͒ monolayer structure below 40 K is a commensurate c(4ϫ2) phase, while increasing temperature to 50 K leads to the occurrence of (1ϫ1) symmetry. From polarization infrared spectroscopy 4,5 ͑PIRS͒, two energetically different adsorption sites are expected for CO below 40 K, whereas the high-temperature phase corresponds to equivalent CO dipoles perpendicular to the surface.…”

Section: Introductionmentioning

confidence: 82%

Dynamical model for the interpretation of the geometry of the (4×2) CO layer adsorbed on MgO (001)

1996

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A consistent interpretation of the (4ϫ2) CO layer geometry is proposed, which reconciles experimental data obtained from electron diffraction, helium atom scattering, and polarization infrared spectroscopy together with interaction potential calculations. We show that dynamical considerations are required to understand the CO adsorption sites and orientations on the basis of these data. ͓S0163-1829͑96͒04923-5͔

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“…2.5a, d) [57,59]. According to low-energy electron diffraction and helium atom scattering studies [60,61], which both indicated the formation of a well-ordered c(4 × 2) CO overlayer on extended MgO(100) surfaces, and polarization dependent IR studies on MgO single-crystals [58], the bands have been assigned to perpendicularly oriented CO molecules adsorbed on regular terrace sites (2,151 cm −1 ), and the in-phase (2,737 cm −1 ) and out-of-phase (2,732 cm −1 ) vibrational excitation of tilted CO in the ordered overlayer. Significant broadening of the IR bands is evident from the corresponding IR spectrum of CO adsorbed on the high-surface area powder sample.…”

Section: Adsorption On Low-coordinated Sitesmentioning

confidence: 99%

Atomic Scale Characterization of Defects on Oxide Surfaces

Nilius

Sterrer

Heyde

et al. 2015

Springer Series in Surface Sciences

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The physics and chemistry of oxide surfaces cannot be recognized without taking into account the variety of lattice defects. Defects largely govern the electronic and optical properties of oxides, they offer potential binding sites for atoms and molecules, and serve as charge centers that control the donor or acceptor character of the material. In this contribution, we demonstrate how the nature of surface defects on oxides can be probed in an ensemble but also on the level of individual defects, focusing on defects on the surface of thin, single-crystalline oxide films of MgO and CeO₂ as prototype examples for non-reducible and reducible oxides, respectively. Scanning probe techniques play a fundamental role in this respect, as they enable direct visualization of surface defects and provide insight into the electronic structure of defects and local potential modulations in their vicinity

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CO adsorbed on MgO(100): a high resolution LEED study

Cited by 44 publications

References 13 publications

CO adsorption on the surface of MgO(001) thin films

CO adsorption on the surface of MgO(001) thin films

Dynamical model for the interpretation of the geometry of the (4×2) CO layer adsorbed on MgO (001)

Atomic Scale Characterization of Defects on Oxide Surfaces

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