Nanoscale motion of organic π-conjugated molecules: exploring van der Waals forces, friction, and quantum effects.

For instance, they assume a free-atom kinetic energy at the transition state and ignore quantum tunnelling, which may be significant for light particles. 63 More critically, they omit energy exchange between the adsorbate and the substrate, which is central to more sophisticated treatments such as Langevin or Fokker–Planck equations. 61,64 This simple hopping picture captures essential features of surface diffusion and holds at

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