  The correction of the self-interaction error (SIE) that is inherent to all
standard density functional theory (DFT) calculations is an object of
increasing interest. In this article we apply the very recently developed
Fermi-orbital based approach for the self-interaction correction (FOSIC) to a
set of different molecular systems. Our study covers systems ranging from
simple diatomic to large organic molecules. We focus our analysis on the direct
estimation of the ionization potential from orbital eigenvalues.
