Fig. 7

Absorption spectrum and electronic coupling strength for a carotenoid–chlorophyll complex. a Calculated absorption spectrum of the rhodopin glucoside-B800 complex as linked by the dashed line in Fig. 2b. CT denotes the charge-transfer state. Oscillator strengths of the S _y and CT states are very weak. Here arrows are used to indicate their positions. b Electronic coupling strengths (in cm⁻¹) for the energy transfer passways from the S₂ and S _y states to the Q _x and Q _y states in the rhodopin glucoside-B850 and rhodopin glucoside-B800 pairs as linked by dashed lines in Fig. 2b. Distances between the centers of corresponding rhodopin glucoside and B850/B800 molecules are given in Fig. 2b