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The ground, excited, and ionized states of free-base porphin (FBP) are reinvestigated by the SAC (symmetry-adapted cluster)/SAC-CI (configuration interaction) method. In particular, the Rydberg excited states, the valence−Rydberg mixing, and the effect of polarization d-functions are studied. The lowest Rydberg excited state would exist at around 5.5 eV with a weak intensity, but the valence−Rydberg mixing is small. The effects of both the Rydberg and polarization d-functions are relatively small for the excitation energies of the main peaks, whereas the polarization d-functions affect considerably the ionization spectrum.

SAC-CI Study on the Excited and Ionized States of Free-Base Porphin: Rydberg Excited States and Effect of Polarization and Rydberg Functions