CALHOUN, TRTRCALHOUNGINSBERG, NSNSGINSBERGSCHLAU-COHEN, GSGSSCHLAU-COHENYUAN-CHUNG CHENGBALLOTTARI, MMBALLOTTARIBASSI, RRBASSIFLEMING, GRGRFLEMING2018-09-102018-09-102009http://scholars.lib.ntu.edu.tw/handle/123456789/346906The near-unity efficiency of energy transfer in photosynthesis makes photosynthetic light-harvesting complexes a promising avenue for developing new renewable energy technologies. Knowledge of the energy landscape of these complexes is essential in understanding their function, but its experimental determination has proven elusive. Here, the observation of quantum coherence using two-dimensional electronic spectroscopy is employed to directly measure the 14 lowest electronic energy levels in lightharvesting complex II (LHCII), the most abundant antenna complex in plants containing approximately 50% of the world's chlorophyll. We observe that the electronically excited states are relatively evenly distributed, highlighting an important design principle of photosynthetic complexes that explains the observed ultrafast intracomplex energy transfer in LHCII. © 2009 American Chemical Society.[SDGs]SDG7Chlorophyll; Electron energy levels; Energy transfer; Harvesting; Photosynthesis; Porphyrins; Quantum theory; Antenna complexes; Design Principles; Efficiency of energy transfer; Electronic energy levels; Electronic spectroscopy; Energy landscape; Experimental determination; In-plants; Light-harvesting complex II; Photosynthetic light; Quantum coherence; Renewable energy technologies; Ultra-fast; Renewable energy resourcesjournal article10.1021/jp908300c2-s2.0-72949104976WOS:000272713000002