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 …

Helium spin echo experiments combined with ab initio based Langevin molecular dynamics
simulations are used to quantify the adsorbate-substrate coupling during the thermal …

Neutron scattering techniques such as quasi-elastic neutron scattering, QENS, have proven
to be well-suited tools for studying structure and dynamics of surface adsorbed molecules. In …

New insight into the nature of diffusion and the origin of friction of a prototype system for
weak physisorption–benzene molecules, C 6 H 6, adsorbed on the basal plane (0 0 0 1) of …

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 …

We present a combined experimental and theoretical study of the self-diffusion of ammonia
on exfoliated graphite. Using neutron time-of-flight spectroscopy we are able to resolve the …

We derive an analytical expression for the intermediate scattering function of a particle on a
flat surface obeying the Generalised Langevin equation, with exponential memory friction …

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 vibrational excitation of molecules adsorbed on a surface is typically probed by
spectroscopic techniques such as infrared or Raman spectroscopy. In the present article we …

Surface diffusion of small adsorbates is analyzed in terms of the so-called intermediate
scattering function and dynamic structure factor, observables in experiments using the well …