  In this paper benchmark results are presented on the calculation of vertical
electronic excitation energies using a long-range second-order polarisation
propagator approximation (SOPPA) description with a short-range density
functional theory (srDFT) description based on the Perdew-Burke-Ernzerhof (PBE)
functional. The excitation energies are investigated for 132 singlet states and
71 triplet states across 28 medium sized organic molecules. The results show
that overall SOPPA-srPBE always performs better than PBE, and that SOPPA-srPBE
performs better than SOPPA for singlet states, but slightly worse than SOPPA
for triplet states when CC3 results are the reference values.
