A variational calculation is presented of energy levels for the nonrelativistic Hamiltonian of the metastable antiprotonic helium atom ${\overline{p}}^{3, 4}{\mathrm{He}}^{+}$. This calculation is based on a molecular expansion of the wave function. We estimate the precision of the results to be about ${10}^{-7\mathrm{}}$ a.u.

• Received 29 April 1996

DOI:https://doi.org/10.1103/PhysRevA.54.R1749