A pair potential assigns an interaction energy to each pair of particles. A pairwise-additive system has .
The Mayer f-function packages the departure of a pair's Boltzmann factor from one and is the basic bond in the dilute-gas cluster expansion.
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Pair potential refers to a mathematical function used in computational physics and chemistry to describe the interaction energy between two particles as a function of their separation distance. It is commonly employed in molecular dynamics simulations and statistical mechanics to model systems at the atomic and molecular level. The pair potential is often denoted as \(V(r)\), where \(r\) is the distance between two interacting particles.