We discuss the computational results on the energetics and features of the bound states of one and two He atoms attached to a Ca atom, which have been presented by Gou and Li in a recently published paper in Phys. Rev. A 85, 012510 (2012). We show that, given their choice for the interaction potential-energy surface, the energy they found for the three-particle complex’s ground state must be incorrect. We also point out that a large number of their excited states for the same system do not really exist since they are located above either of the two-atom components’ bound-state energies.

The ground state energy of the He-He-Ca triatomic system is incorrect and many of the excited states presented by Gou and Li are not real, as they are above either of the two-atom components' bound-state energies.

Comment on “Weakly bound states of the He-He-Ca triatomic system”

Key Takeaway: The ground state energy of the He-He-Ca triatomic system is incorrect and many of the excited states presented by Gou and Li are not real, as they are above either of the two-atom components' bound-state energies.