统计力学中,粒子系统(原子、分子、胶体,……)中, 径向分布函数, (也叫做 对关联函数) 为相距参考粒子处粒子的密度。

的计算
兰纳-琼斯势流体的径向分布函数,

对于均匀和各项同性体系,设参考粒子处于原点 O,粒子平均数密度为 ,距离 O 处局域时间平均密度为


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