In this review we give a detailed description of the recently developed helium-3 spin-echo
technique and its application to several classes of surface dynamic measurements. We …

In this short review, we provide an update of recent developments in Kramers' theory of
reaction rates. After a brief introduction stressing the importance of this theory initially …

An elementary process occurring on surfaces is diffusion. The dynamics is simplest when
the concentration of adsorbates is sufficiently small that interaction between adsorbates can …

Spin-echo measurements offer a major step forward in the technique of helium atom surface
scattering. The experimental energy transfer resolution has been improved by several …

The experimental line shape broadening observed in adsorbate diffusion on metal surfaces
with increasing coverage is usually related to the nature of the adsorbate-adsorbate …

Surface diffusion is described in terms of the intermediate scattering function in the time
domain and reciprocal space. Two extreme time regimes are analyzed, ballistic (very short …

The van Hove formula for the dynamical structure factor (DSF) related to particle scattering at
mobile adsorbates is extended to include the relaxation of the adsorbates' vibrational states …

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 …

The dynamics of atoms or molecules adsorbed on a metal surface, and excited by collisions
with an atomic beam, are treated within a theory that includes energy dissipation into lattice …