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A novel ultrahigh vacuum (UHV) tribometer was used to study the tribological behavior of two Cu(111) surfaces modified by the adsorption of various molecular species (ethanol, butanol and heptafluorobutanol). Friction measurements were made at coverages ranging from submonolayer to several multilayers. These alcohols showed similar friction behavior as a function of coverage. At coverages below one...
A comparison is presented between macroscopic constants relating to the diffusion dynamics of a Cu atom on a Cu surface and their microscopic estimates. Comparison of elastic constants, speed of sound and friction coefficient indicates that a generalized Langevin equation (GLE) description of the diffusion dynamics of the Cu adatom is quite reasonable. This serves as a further justification for the...
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