Energy of Interaction between a Hydrogen Atom and a Helium Atom

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Abstract
The potential energy of interaction between a hydrogen atom and a helium atom has been calculated as a function of separation distance by standard quantum mechanical variation procedures. The approximate molecular wave functions used contained both homopolar and ionic contributions, and were constructed from 1s hydrogen‐like atomic wave functions. All integrals involved have been evaluated accurately. The results are in agreement with a potential determined from measurements of the scattering of high velocity hydrogen atoms in helium gas. For separation distances greater than 1 A, the results have been combined with an estimate of the potential of the London dispersion forces, and the combination has been represented by an exp‐six potential useful in the calculation of properties of gases.

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