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Reference.org
Pair distribution function
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<p>The pair distribution function describes the distribution of distances between pairs of particles contained within a given volume. Mathematically, if <i>a</i> and <i>b</i> are two particles, the pair distribution function of <i>b</i> with respect to <i>a</i>, denoted by g a b ( r → ) {\displaystyle g_{ab}({\vec {r}})} is the probability of finding the particle <i>b</i> at distance r → {\displaystyle {\vec {r}}} from <i>a</i>, with <i>a</i> taken as the origin of coordinates. </p>