Pal G., Pavlyukh Y., Schneider H. C., Hübner W.

A novel approach for GW-based calculations of quasiparticle properties for finite systems is presented, in which the screened interaction is obtained directly from a linear response calculation of the density-density correlation function. The conserving nature of our results is shown by explicit evaluation of the f-sum rule. As an application, energy renormalizations and level broadenings are calculated for the closed-shell Na₉⁺ and Na₂₁⁺ clusters, as well as for Na₄. Pronounced improvements of conserving approximations to RPA-level results are obtained.

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