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60502.pdf (1.2 MB)

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Data de publicació

1990

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/9825

Theoretical analysis of the bonding of oxygen to Cu(100)

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Director/Tutor

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Recurs relacionat

http://dx.doi.org/10.1103/PhysRevB.42.10852

Resum

The chemisorption of O/Cu(100) has been modeled by a Cu 5 O cluster; ab initio self-consistent-field electronic wave functions have been obtained for this cluster. The bonding has been analyzed using several new theoretical methods: (1) the variation of the Cu 5 O dipole moment with the distance of O from the surface; (2) the projection of the O orbitals from Cu 5 O; and (3) the constrained space orbital variation (CSOV) method for the development of the bond. It is concluded that the bond is dominantly ionic but with a significant covalent contribution. Our results indicate that the excess charge on O is ∼1.5 electrons. We have computed the CSOV analysis for Cu 5 O and for Cu 5 with point charges. The comparison of these two clusters has allowed us to have a definitive measure of the contribution of the Cu d electrons to the covalent bond. The total contribution of the d electrons to the bond is rather large (1.2 eV). Once the different contributions are separated, it is shown that purely electrical polarization effects account for ∼0.5 eV, while the direct participation of the d electrons in the covalent bond is ∼0.7 eV.

Matèries

Química de superfícies, Orbitals atòmics

Matèries (anglès)

Surface chemistry, Atomic orbitals

Citació

Col·leccions

Articles publicats en revistes (Ciència dels Materials i Química Física)

Citació

BAGUS, Paul S. and ILLAS I RIERA, Francesc. Theoretical analysis of the bonding of oxygen to Cu(100). Physical Review B. 1990. Vol. 42, num. 17, pags. 10852-10857. ISSN 0163-1829. [consulted: 3 of August of 2026]. Available at: https://hdl.handle.net/2445/9825

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