Abstract

The distribution function governing the equilibrium separation of two atoms on a single crystal plane has been measured for the first time. Quantitative determinations for tungsten atoms self-adsorbed on the (211) and (321) planes of tungsten reveal that, for interatomic distances $R>7$ \AA{}, the behavior of the atoms conforms to that of independent particles. Long-range interactions are below the detection limit of $\ensuremath{\approx}\frac{\mathrm{kT}}{2}$, where $T$ is the equilibration temperature, in agreement with present theories of interatomic interactions.

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