76 citations · 309 across the 13 of their papers we have counts for
13 papers
Structure and dynamics investigations of a partially hydrogenated graphene/Ni(111) surface
Emanuel Bahn, Anton Tamtögl, John Ellis +2
Using helium-3 atom scattering, we have studied the adsorption kinetics, the structure and the diffusional dynamics of atomic hydrogen on the surface of a graphene monolayer on Ni(…
Justification for the use of Markovian Langevin statistics in the modelling of activated surface diffusion
J. Wilkinson, J. Ellis
Low temperature surface diffusion is driven by the thermally activated hopping of adatoms between adsorption sites. Helium spin-echo techniques, capable of measuring the sub-picose…
Inter-adsorbate forces and coherent scattering in helium spin-echo experiments
David J. Ward, Arjun Raghavan, Anton Tamtögl +5
In studies of dynamical systems, helium atoms scatter coherently from an ensemble of adsorbates as they diffuse on the surface. The results give information on the co-operative beh…
Amplitude of jump motion signatures in classical vibration-jump dynamic
Peter S. M. Townsend, John Ellis
The classical Langevin dynamics of a particle in a periodic potential energy landscape are studied via the intermediate scattering function (ISF). By construction, the particle per…
Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene
Anton Tamtögl, Emanuel Bahn, Marco Sacchi +7
The interfacial behaviour of water remains a central question to fields as diverse as protein folding, friction and ice formation[1,2]. While the structural and dynamical propertie…
Nanoscale Surface Dynamics of BiTe(111): Observation of a Prominent Surface Acoustic Wave and the Role of van der Waals Interactions
Anton Tamtögl, Davide Campi, Martin Bremholm +8
We present a combined experimental and theoretical study of the surface vibrational modes of the topological insulator BiTe. Using high-resolution helium-3 spin-echo spectr…
A Helium-Surface Interaction Potential of BiTe(111) from Ultrahigh-Resolution Spin-Echo Measurements
Anton Tamtögl, Michael Pusterhofer, Martin Bremholm +7
We have determined an atom-surface interaction potential for the HeBiTe(111) system by analysing ultrahigh resolution measurements of selective adsorption resonances. Th…
Polarisation in Spin-Echo Experiments: Multi-point and Lock-in Measurements
Anton Tamtögl, Benjamin Davey, David J. Ward +3
Spin-echo instruments are typically used to measure diffusive processes and the dynamics and motion in samples on ps and ns timescales. A key aspect of the spin-echo technique is t…
Electron-Phonon Coupling and Surface Debye Temperature of BiTe(111) from Helium Atom Scattering
Anton Tamtögl, Patrick Kraus, Nadav Avidor +9
We have studied the topological insulator BiTe(111) by means of helium atom scattering. The average electron-phonon coupling of BiTe(111) is determined by adapt…
How Atomic Steps Modify Diffusion and Inter-adsorbate Forces: Empirical Evidence From Hopping Dynamics in Na/Cu(115)
O. Godsi, G. Corem, T. Kravchuk +7
We followed the collective atomic-scale motion of Na atoms on a vicinal Cu(115) surface within a time scale of pico to nano-seconds using helium spin echo spectroscopy. The well de…
Energy Dissipation during Diffusion at Metal Surfaces: Disentangling the Role of Phonons vs. Electron-Hole Pairs
Simon P. Rittmeyer, David J. Ward, Patrick Gütlein +3
Helium spin echo experiments combined with ab initio-based Langevin molecular dynamics simulations are used to quantify the adsorbate-substrate coupling during the thermal diffusio…
Quantum effects in the diffusion of hydrogen on Ru(0001)
Eliza M. McIntosh, K. Thor Wikfeldt, John Ellis +2
An understanding of hydrogen diffusion on metal surfaces is important, not just for its role in heterogeneous catalysis and hydrogen fuel cell technology, but also because it provi…
Atomic scale friction of molecular adsorbates during diffusion
B. A. J. Lechner, A. S. de Wijn, H. Hedgeland +4
Experimental observations suggest that molecular adsorbates exhibit a larger friction coefficient than atomic species of comparable mass, yet the origin of this increased friction…