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A.B.Wittkower, G.Levy, H.B. Gilbody // Proc. Phys. Soc. v.91 p.862 (1967)

Experiment

Fig. 2 He 0 + H 2 σ 0,1
Fig. 3 He 0 + He σ 0,1
Fig. 4 He + + H 2 σ 1,0
Fig. 5 He + + He σ 1,0