title: Observation of microscopic CO dynamics on Cu(001) using 3He spin-echo spectroscopy.
abstract: We present momentum resolved measurements of quasielastic helium atom scattering made using a new 3He spin-echo spectrometer. Our data for the dynamics of CO on Cu(001) indicates an activated jump mechanism which we analyze in detail using molecular dynamics simulations. A nearly isotropic potential energy surface is found with an average barrier height of approximately 125 meV, yielding comparable hopping rates along both the <110> and <100> directions. The measurements provide the first rigorous experimental test of state-of-the-art first-principles calculations previously made on this system.
authors.affiliation: Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, UK. ga232@cam.ac.uk
authors.forename: G
authors.initials: G
authors.lastname: Alexandrowicz
authors.forename: A P
authors.initials: AP
authors.lastname: Jardine
authors.forename: P
authors.initials: P
authors.lastname: Fouquet
authors.forename: S
authors.initials: S
authors.lastname: Dworski
authors.forename: W
authors.initials: W
authors.lastname: Allison
authors.forename: J
authors.initials: J
authors.lastname: Ellis