Long-range interactions between a He ( 2 S 3 ) atom and a He ( 2 P 3 ) atom for like isotopes

For the interactions between a He(2 {sup 3}S) atom and a He(2 {sup 3}P) atom for like isotopes, we report perturbation theoretic calculations using accurate variational wave functions in Hylleraas coordinates of the coefficients determining the potential energies at large internuclear separations. W...

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