Electronic excitations of manganese phthalocyanine molecules.

We have investigated the electronic excitation spectrum of individual manganese phthalocyanine (MnPc) molecules in a coronene matrix. Our results corroborate that the observed excitation spectrum is rather sensitive to oxygen contamination of the respective samples. Annealing in vacuum allowed the determination of the electronic excitations of individual MnPc molecules. These results confirm previous data from the literature and, in addition, we have identified a low energy excitation at about 0.8 eV, which had not been reported before.