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. Recent spin-echo spectroscopy measurements have demonstrated that benzene/graphite displays almost perfect Brownian diffusion and that it can be used as a tool to study dynamic friction. Incoherent neutron backscattering measurements, on the other hand, reveal a jump diffusion behaviour, related to the molecular rotational modes of the benzene rings. Molecular dynamics (MD) simulations have delivered a very detailed picture of the adsorbate dynamics. We use this review to illustrate the open questions and possible future directions of this research field.
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