BOUND EXCITED-STATES OF H- AND HE- IN THE STATICALLY SCREENED COULOMBPOTENTIAL

The stability of the bound excited states of both the hydrogen and hel ium anions in an environment represented by the statically screened Co ulomb potential have been studied. Energies have been calculated at th e full configuration interaction level of theory, as a function of the screening parameter. Our calculations demonstrate that the bound exci ted states of both H- and He- survive only under mild screening condit ions. Stronger screening will yield a sequential electron detachment p rocess. Finally, the applicability of the present calculations to mode l real plasmas is discussed.