The coverage dependent dynamics of CO on a Cu (111) surface are studied on an atomic
scale using helium spin-echo spectroscopy. CO molecules occupy top sites preferentially …

Activated surface diffusion with interacting adsorbates is analyzed within the Linear
Response Theory framework. The so-called interacting single adsorbate model is justified …

Helium-3 surface spin echo spectroscopy (HeSE) has been used to measure the diffusive
dynamics of adsorbates on close-packed metal surfaces, namely hydrogen on Cu (111), Pd …

The thesis describes several aspects of structure and dynamics at surfaces studied using the
helium spin-echo technique. The first chapter introduces helium atom scattering as an …

A complete analytical model for the rotational and translational diffusion of molecules with a
six-fold point symmetry on a hexagonal lattice is presented. It can be applied, in particular, to …

Surface diffusion of interacting adsorbates is here analyzed within the context of two
fundamental phenomena of quantum dynamics, namely the quantum Zeno effect and the …

The role of incoherent tunneling in the diffusion of light atoms on surfaces is investigated.
With this purpose, a Chudley–Elliot master equation constrained to nearest neighbors is …

Phonon lineshapes in atom–surface scattering are obtained from a simple stochastic model
based on the so-called Caldeira–Leggett Hamiltonian. In this single-bath model, the excited …

Strictly speaking, real physical systems do not exist in complete isolation in nature. The
interaction with the environment generally causes the system to become a statistical mixture …

The previous chapters have been devoted to summarizing the vast knowledge acquired
about the single phonon vibrations of atoms in or near the surface and about atoms and …