A perturbation calculation, valid in the limit of large separations, of various properties of the 2pπ state of HeH2+ is carried out. The total energy and the kinetic and potential energies are calculated to the fifth order, the dipole moment to the third order and the quadrupole moments to the second order and the results compared with those obtained using exact and variationally determined two-centre wave functions. Some results are also given for the 2pπu and 3dπg states of H+2 and the influence of nuclear symmetry at large separations is briefly discussed.
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Dalgarno et al. (1957) studied this question.
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