Borromean binding in with screened Coulomb potentials

The stability of the bound P and D states of the H 2 + system, where the nuclei and the electron interact through a screened Coulomb (Yukawa-type) potential exp(−μr)/r, has been studied for different values of the screening parameters μ using correlated exponential wave functions in the framework of Ritz variational principle. The critical values of the screening parameters for the bound S, P and D states are reported for which H 2 + system is stable, while all the possible fragments are unbound, that is, it shows Borromean binding.