The energy and oscillator strength of electronic transitions of chlorophyll (Chl)–amino acid complexes were calculated by using molecular orbital methods. The energies varied widely with coordinated amino acids and the difference between the maximum and minimum energy was about 830 cm−1. This energy difference was comparable with the spreading of absorption bands for light-harvesting Chl–protein complexes of photosystem II (LHC II) of green plants. The feature of the Qy band for pea LHC II was interpreted with the aid of the calculated energies and oscillator strengths. Four spectral components of the band were assigned to individual Chl–amino acid complexes.
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Vol. 73 • No. 3