Long-range interactions for He(nS)-He (n′ S) and He(nS)-He (n′ P)

Abstract

For helium, long-range interaction coefficients C3, C6, C8, C9, and C10 for all S-S and S-P pairs of the energetically lowest five states (1 S1, 2 S3, 2 S1, 2 P3, and 2 P1) are calculated precisely using correlated wave functions in Hylleraas coordinates. Finite nuclear isotope mass effects are included. © 2006 The American Physical Society.