The scattering of Be⁺⁺ ions of energy 100-800 eV by He has been measured by observing the energy-loss spectrum of the ions on traversing various path lengths of the scattering gas. The scattering data have been analyzed to determine an interaction energy for Be⁺⁺ and He for the internuclear separations from 0.15 to 1.0 {}. While not strictly logarithmic, the results can be approximately fitted by an expression for the interaction which is V(r)=6.0×10²×e^-5.70r eV, with r in {}. A Thomas-Fermi-Dirac calculation of the interaction energy fits the experimental result well for $r>0.3$ {}.
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Giffen et al. (1971) studied this question.
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