MOLECULAR APPROACH FOR THE BOUND-STATES OF AB-A COULOMB-SYSTEMS FROM H-2(+) TO PS(-)

An alternative approach is introduced for adiabatic and nonadiabatic calculations in the ABA Coulomb systems from H2+ to the positronium negative ion Ps- (e-e+e-) so that they are treated as molecular systems. The adiabatic vibrational solutions point out the most relevant ''nuclear'' configurations that should appear in the construction of the nonadiabatic wave function and reveal the importance of the AA vibrations at this stage. Applications provide evidence for the separability of the ground state of Ps- and give energy values for six S bound states of μ+e-μ+ that seem not to be reported so far. © 1995 The American Physical Society.