# Binding energy of a molecular ion?

The protons in the $$\text{H}_2^{+}$$ molecular ion are $$0.106 \, \mathrm{nm}$$ apart, and the binding energy of $$\text{H}_2^{+}$$ is $$2.65\,\mathrm{eV} .$$ What negative charge must be placed halfway between two protons this distance apart to give the same binding energy?

Question: In the above quote, does "the binding energy of $$\mathrm{H}_2^{+}$$" refer to the energy required to disassemble the whole system (two protons and one electron) or just the protons?