Article 1 Binding Sites 1 Chlorophyll 1 Electron transfer 1 Exciplex 1 Femtosecond absorption spectroscopy Hydrogen Bonding 1 Molecular Conformation 1 Mutation 1 Photosynthesis 1 Photosystem I Protein Complex 1 Primary charge separation 1 Principal Component Analysis 1 Principal component analysis 1 Spectrophotometry 1 Synechocystis 1 Water 1 absorption spectroscopy 1 adiabaticity 1 amino acid analysis 1 amino acid substitution 1 bacterial strain 1 binding site 1 chemistry 1 chlorophyll 1 chlorophyll 2A 1 chlorophyll 2B 1 conformation 1 controlled study 1 electron transport 1