For the P D1 P D2 pair, charge transfer states (P D1 →P D2 , P D2 →P D1 ) appear only at the high energy end of the spectrum, see Figure . Notably, no CT character occurs for the lowest lying excited states. This means that any energy that the P D1 P D2 pair receives, radiatively or non-radiatively, would not be funneled into a charge separated state upon internal conversion. This behaviour is in a strong contrast to the Chl D1 Pheo D1 pair.