How does tuning the van der Waals bonding strength affect adsorbate structure and nanoscale diffusion?
We plan to characterise the effect of van-der-Waals (vdW) interactions between heterocyclic analogues of benzene and graphite on the surface adsorption structure and diffusion process. Therefore we propose to measure the structure and diffusion of pyrazine (C4H4N2) on exfoliated graphite. By substituting nitrogen atoms into the ring of aromatic hydrocarbons the electronic density around the carbon atoms of the molecule is reduced, giving rise to a stronger bonding with the substrate via tuning of the vdW interaction. Hence, by systematically changing the interaction strength with the substrate, these experiments will allows us to elucidate the influence of the vdW interaction strength on the adsorption structure and the nanoscale diffusion process. The latter includes different aspects of energy dissipation in surface diffusion, in particular the contribution of electronic friction.
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TAMTOEGL Anton; AVIDOR Nadav; FOUQUET Peter; Thomas C. Hansen; HEDGELAND Holly; KOZA Michael Marek; RUCKHOFER Adrian; Marco Sacchi and TRUSCOTT Chris. (2019). How does tuning the van der Waals bonding strength affect adsorbate structure and nanoscale diffusion?. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-05-508
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