Abstract
We report direct high-resolution capacitor measurements of the force against distance between crossed cylindrical mica surfaces in air. The dispersion interaction in the range of distances between 20 and 100 nm occurs in the retarded regime. The force is found to vary as the inverse cube of the distance of nearest separation in good agreement with the early measurements of Tabor and Winterton. The measured deformation on contact is in agreement with the theory of Johnson, Kendall, and Roberts. The plane of origin of the retarded van der Waals force is shifted outward from the equilibrium contact position at zero external load by the magnitude of contact deformation.
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