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A general formalism is used to express the long-range potential energies in inverse powers of the separation distance between two like atomic or molecular systems with P symmetries. The long-range molecular interaction coefficients are calculated for the molecular symmetries Δ, Π, and Σ, arising from the following interactions: He(2 ^1P)--He(2 ^1P), He(2 ^1P)--He(2 ^3P), and He(2 ^3P)--He(2 ^3P). The electric quadrupole-quadrupole term, C_5, the van der Waals (dispersion) term C_6, anddoi:10.1103/physreva.76.012723 fatcat:nybagtv36ret5gejl22pcyycxq