Generalized Chudley-Elliott vibration-jump model in activated atom surface diffusion.

@article{MartinezCasado2007GeneralizedCV,
  title={Generalized Chudley-Elliott vibration-jump model in activated atom surface diffusion.},
  author={Ruth Martinez-Casado and Jos{\'e} Luis Vega and {\'A}ngel S. Sanz and Salvador Miret-Art{\'e}s},
  journal={The Journal of chemical physics},
  year={2007},
  volume={126 19},
  pages={
          194711
        }
}
Here the authors provide a generalized Chudley-Elliott expression for the activated atom surface diffusion which takes into account the coupling between both low-frequency vibrational motion (namely, the frustrated translational modes) and diffusion. This expression is derived within the Gaussian approximation framework for the intermediate scattering function at low coverage. Moreover, inelastic contributions (arising from creation and annihilation processes) to the full width at half maximum… 

Figures from this paper

TOPICAL REVIEW: Quasielastic He atom scattering from surfaces: a stochastic description of the dynamics of interacting adsorbates
The study of diffusion and low-frequency vibrational motions of particles on metal surfaces is of paramount importance; it provides valuable information on the nature of the adsorbate–substrate and
Quantum Zeno and anti-Zeno effects in surface diffusion of interacting adsorbates
TLDR
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 anti-Zeno effect, which are found to have already been observed.
The intermediate scattering function for quasi-elastic scattering in the presence of memory friction
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. Numerical
Amplitude of jump motion signatures in classical vibration-jump dynamics.
TLDR
Numerical simulations of the Langevin equation in one and two spatial dimensions confirm that for a strongly corrugated potential the analytical approximation provides a good qualitative description of the trend in the jump signature amplitude, between the points where the factorization is exact.
Diffusion of light adsorbates on transition metal surfaces
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(111) and Ru(0001), carbon
Questions arising for future surface diffusion studies using scattering techniques—the case of benzene diffusion on graphite basal plane surfaces
TLDR
This paper gives a review of recent work on benzene diffusion on graphitic carbon surfaces using neutron and helium scattering spectroscopy as well as computational modelling to illustrate the open questions and possible future directions of this research field.
...
...

References

SHOWING 1-10 OF 11 REFERENCES
Quasi-elastic peak lineshapes in adsorbate diffusion on nearly flat surfaces at low coverages: the motional narrowing effect in Xe on Pt(111)
TLDR
The type of analysis presented here for the quasi-elastic peak should be prior to any deconvolution procedure carried out in order to better extract information from the process, e.g. diffusion coefficients and jump distributions.
Kramers’ turnover theory for diffusion of Na atoms on a Cu(001) surface measured by He scattering
The diffusion of adatoms and molecules on a surface at low coverage can be measured by helium scattering. The experimental observable is the dynamic structure factor. In this article, we show how
EXPERIMENTAL AND THEORETICAL INVESTIGATION OF THE MICROSCOPIC VIBRATIONAL AND DIFFUSIONAL DYNAMICS OF SODIUM ATOMS ON A CU(001) SURFACE
The microscopic diffusional and vibrational motion of sodium atoms on a Cu~001! surface have been studied with high-resolution helium atom scattering. The data are analyzed through a Langevin
The dynamics of activated surface diffusion
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 be ignored. But
Neutron Scattering from a Liquid on a Jump Diffusion Model
The incoherent inelastic scattering cross section of slow neutrons from liquids is calculated using a simple model in which the liquid is assumed to have appreciable short range order in a
The Dipolar Broadening of Magnetic Resonance Lines in Crystals
In regular crystals, the width of the absorption lines arising from the magnetic moment of the electron or nucleus is caused primarily by the interaction between the magnetic dipoles. It is
Correlations in Space and Time and Born Approximation Scattering in Systems of Interacting Particles
A natural time-dependent generalization is given for the well-known pair distribution function g(r) of systems of interacting particles. The pair distribution in space and time thus defined, denoted
Quasielastic and low vibrational lineshapes in atom-surface diffusion
The diffusion and low frequency vibrational motions of atoms and molecules on surfaces can be measured by means of quasielastic helium atom scattering. In this paper, we discuss and investigate
...
...