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Physical arguments and comparisons with published experimental data suggestthat in simple liquids: i) single-molecule-scale viscous forces are produced bytemperature-dependent London dispersion forces, ii) viscosity decay withincreasing temperature reflects electron cloud compression and attendantsuppression of electron screening, produced by increased nuclear agitation, andiii) temperature-dependent self-diffusion is driven by a narrow band of phononfrequencies lying at the low-frequency end of the solid-state-like phononspectrum. The results suggest that collision-induced electron cloud distortionplays a decisive role in single molecule dynamics: i) electron cloudcompression produces short-lived repulsive states and single molecule,self-diffusive hops, while ii) shear-induced distortion generates viscosity andsingle-molecule-scale viscous drag. The results provide new insight intononequilibrium molecular dynamics in nonpolar, nonmetallic liquids.

On the physical mechanisms underlying single molecule dynamics in simple liquids