Antenna molecules Reaction- center chlorophyll Light Light excites an antenna molecule (chlorophyll or accessory pigment) raising an electron to a higher energy level. The excited rophy rgy to a ing it- This energy is reaction-center chlorophyll exeiting it. The excited r reactio ch an elec to The electron hole in the action ce ter is donor an el from an electron d The absorption of a photon has caused separation of charge in the reaction center