Diffusion of pyrene molecules: the transition to ballistic diffusion
Graphite surfaces are an ideal playground for studying the fundamentals of two-dimensional diffusion processes and friction using neutron scattering. In a recent experiment we have observed for the first time an almost perfect 2d Brownian diffusion for flat lying benzene molecules adsorbed on exfoliated graphite. In the present experiment we want to investigate a larger aromatic molecule (pyrene) and apply lower coverage with the aim to increase the mean free path which would allow us to observe the expected transition from Brownian to ballistic dynamics. This should tell us more about the influence of eventual substrate friction and the loss of memory.
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FOUQUET Peter; CALVO ALMAZAN Irene and KOZA Michael Marek. (2015). Diffusion of pyrene molecules: the transition to ballistic diffusion. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-05-440
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