IP lowering ΔE0 = E0(μ)−E0(μ = 0) as function of the effective ionic charge Zeff = Z − N + 1 for two different values of μ. Circles: MCDF calculations. Triangles: DH limit (ΔE0 = −Zeff μ). Red: μ = 0.1 au. Black: μ = 0.25 au. The broken trends observed for Zeff = 7 (O VII) in MCDF calculations are due to the absence of electron–electron plasma screening in the ground state of O VIII that contributes to the ionization potentials of O VII.
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