Phonon dynamics and structure of the deuterated diamond(111)-(1{times}1) surface: Experiment and theory
- Max-Planck-Institut fuer Stroemungsforschung, Bunsenstrasse 10, D-37073Goettingen (Germany)
- Department of Chemistry (S.A.S.) and Department of Physics (J.G.S.) and MARTECH, Florida State University, Tallahassee, Florida32306
- Universitaet Muenster, Institut fuer Theoretische Physik II, Wilhelm-Klemm-Strasse 10, D-48149Muenster (Germany)
Surface-phonon dispersion curves for deuterium-terminated C(111)-(1{times}1) have been measured out to the surface Brillouin zone boundary in both the [10{bar 1}] and [1{bar 2}1] high-symmetry directions by helium-atom scattering (HAS). The experimental results are compared with calculated surface-phonon dispersion curves obtained within a semiempirical total-energy scheme and with previous HAS measurements on the hydrogen-terminated C(111)-(1{times}1) surface. The experimental and theoretical results are in very good agreement and they clearly reveal a distinctive isotope shift of the Rayleigh mode energies along the boundaries of the surface Brillouin zone when the H adatoms are replaced by D. The comparison provides evidence for a single hydrogen/deuterium atom terminating each substrate C-atom site. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 600994
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 16 Vol. 57; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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