title: Energetics and vibrational states for hydrogen on Pt(111).
abstract: We present a combination of theoretical calculations and experiments for the low-lying vibrational excitations of H and D atoms adsorbed on the Pt(111) surface. The vibrational band states are calculated based on the full three-dimensional adiabatic potential energy surface obtained from first-principles calculations. For coverages less than three quarters of a monolayer, the observed experimental high-resolution electron peaks at 31 and 68 meV are in excellent agreement with the theoretical transitions between selected bands. Our results convincingly demonstrate the need to go beyond the local harmonic oscillator picture to understand the dynamics of this system.
authors.affiliation: Helsinki Institute of Physics and Laboratory of Physics, Helsinki University of Technology, P.O. Box 1100, FIN-02015 HUT, Espoo, Finland.
authors.forename: S C
authors.initials: SC
authors.lastname: Bădescu
authors.forename: P
authors.initials: P
authors.lastname: Salo
authors.forename: T
authors.initials: T
authors.lastname: Ala-Nissila
authors.forename: S C
authors.initials: SC
authors.lastname: Ying
authors.forename: K
authors.initials: K
authors.lastname: Jacobi
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: K
authors.initials: K
authors.lastname: Bedürftig
authors.forename: G
authors.initials: G
authors.lastname: Ertl