Electronic structure methods for electronically excited states in transition-metal complexes

In my group we are working on new computational methods to describe electronically excited states in molecules. These should primarily be applied to transition-metal complexes. To describe excitations between organic ligands and metal centers, we use time-dependent perturbation theory approaches for multi-reference methods. We were able to achieve that excitations from degenerate ground states are also possible. Furthermore, we have developed a simple method that improves the accuracy of the calculated excitation energies.