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The Bethe-Salpeter equation for plasmas containing ions with higher charges is solved by perturbation methods. The lowering of the ionization energy as well as the energy level shifts due to nonideality effects are calculated. It is shown that multiply charged ions lead to an essential amplification of nonideality effects. An estimate for the modification of transition rates is given.

Ionization Energy and Level Shifts of Multiply Charged Ions in Nonideal Plasmas