Stable atomic trapping sites in the Lennard-Jones face-centered cubic Ar crystals are investigated by means of the global optimization strategy and convex hull concept for thermodynamic stability. Five generic site types are found in full accord with crystallographic intuition: interstitial within tetrahedral and octahedral hollows and substitutions, single, tetra-and hexavacancy. Their identities are established by radial distribution function analysis. Stability regions of these sites are mapped into the space of Lennard-Jones parameters of the guest-host interatomic interaction. Predictions made for the number and types of the stable sites for selected atoms (H, Mn, Na, Yb, Eu, Ba) are found to be in line with the results of more sophisticated models and matrix isolation spectroscopy experiments.

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