- Email: [email protected]
Dynamics of atoms on silicon substrates
A370 955
Surface Science 251/252 (1991) 955 959 North-Holland
Dynamics of atoms on silicon substrates P. Ashu, C.C. Matthai and T.-H. Shen Department of Physics, University of Wales College ol Cardiff P.O. Box 913, Cardiff CF1 3TH, UK Received 1 October 1990; accepted for publication 15 January 1991
The molecular dynamics method is used to simulate the diffusion of adatoms on S i ( l l l ) and Si(001) surfaces. We propose a scheme whereby the interatomic interactions in multi-component systems can be obtained from a knowledge of the interactions in each component. We find that Ni atoms are more mobile than Si adatoms and that of the (001)(2 × 1) reconstructed surface, Si adatoms prefer to move across the dimers with a very low diffusion barrier.
960
Surface Science 251/252 (1991) 960-964 North-Holland
The early stages of growth of crystalline, diamond-like films on Si(100) by pulsed laser evaporation of graphite S. Ferrer, F. Comin, J.A. Martin, L. Vazquez 1 and P. Bernard European Synchrotron Radiation Facility, B.P. 220, 38043 Grenoble Cedex, France Received 1 October 1990; accepted for publication 15 January 1991 Pulsed laser evaporation of graphite targets in an ultra high v a c u u m environment has been utilized to deposit ultra thin carbon films on Si(100) substrates. Analysis of the fine structure of the carbon Auger line reveals significant sp 3 bonding. STM images show that the films are crystalline and that the surface lattice is hexagonal.
Surface Science 251/252 (1991) 965-970 North-Holland
965
Inverse photoemission study of carbon monoxide bonding to transition metals G. Rangelov, N. Memmel, E. Bertel and V. Dose Max-Planck-lnstitut ]'ur Plasmaphysik, EURA TOM-Association, W-8046 Garching~ German), Received 1 October 1990; accepted for publication 30 October 1990 The unoccupied CO derived bands for the densely packed CO monolayer on Ni(ll0), Pd(ll0), and Pt(ll0) have been investigated by inverse photoemission. In all three cases four CO derived bands can be observed in the region of the 2~r * and 50 * orbitals. For Ni and Pd the band dispersions show the signature of ~r bands. N o evidence is found for unoccupied o contributions, i.e. for 5a donation. However, in Pt the band dispersions are significantly different and hint at a significant 5a donation. The energy position of the CO derived manifold is rather similar for all three metals. These results on the electronic structure are consistent with thermodynamical and vibrational data reported in the literature for the three systems.
Surface Science 251/252 (1991) 955 959 North-Holland
Dynamics of atoms on silicon substrates P. Ashu, C.C. Matthai and T.-H. Shen Department of Physics, University of Wales College ol Cardiff P.O. Box 913, Cardiff CF1 3TH, UK Received 1 October 1990; accepted for publication 15 January 1991
The molecular dynamics method is used to simulate the diffusion of adatoms on S i ( l l l ) and Si(001) surfaces. We propose a scheme whereby the interatomic interactions in multi-component systems can be obtained from a knowledge of the interactions in each component. We find that Ni atoms are more mobile than Si adatoms and that of the (001)(2 × 1) reconstructed surface, Si adatoms prefer to move across the dimers with a very low diffusion barrier.
960
Surface Science 251/252 (1991) 960-964 North-Holland
The early stages of growth of crystalline, diamond-like films on Si(100) by pulsed laser evaporation of graphite S. Ferrer, F. Comin, J.A. Martin, L. Vazquez 1 and P. Bernard European Synchrotron Radiation Facility, B.P. 220, 38043 Grenoble Cedex, France Received 1 October 1990; accepted for publication 15 January 1991 Pulsed laser evaporation of graphite targets in an ultra high v a c u u m environment has been utilized to deposit ultra thin carbon films on Si(100) substrates. Analysis of the fine structure of the carbon Auger line reveals significant sp 3 bonding. STM images show that the films are crystalline and that the surface lattice is hexagonal.
Surface Science 251/252 (1991) 965-970 North-Holland
965
Inverse photoemission study of carbon monoxide bonding to transition metals G. Rangelov, N. Memmel, E. Bertel and V. Dose Max-Planck-lnstitut ]'ur Plasmaphysik, EURA TOM-Association, W-8046 Garching~ German), Received 1 October 1990; accepted for publication 30 October 1990 The unoccupied CO derived bands for the densely packed CO monolayer on Ni(ll0), Pd(ll0), and Pt(ll0) have been investigated by inverse photoemission. In all three cases four CO derived bands can be observed in the region of the 2~r * and 50 * orbitals. For Ni and Pd the band dispersions show the signature of ~r bands. N o evidence is found for unoccupied o contributions, i.e. for 5a donation. However, in Pt the band dispersions are significantly different and hint at a significant 5a donation. The energy position of the CO derived manifold is rather similar for all three metals. These results on the electronic structure are consistent with thermodynamical and vibrational data reported in the literature for the three systems.