Photosynthetic Light Harvesting by Carotenoids: Detection of an Intermediate Excited State

See allHide authors and affiliations

Science  20 Dec 2002:
Vol. 298, Issue 5602, pp. 2395-2398
DOI: 10.1126/science.1074685

You are currently viewing the abstract.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution


We present the first direct evidence of the presence of an intermediate singlet excited state (Sx) mediating the internal conversion from S2 to S1in carotenoids. The S2 to Sx transition is extremely fast and is completed within approximately 50 femtoseconds. These results require a reassessment of the energy transfer pathways from carotenoids to chlorophylls in the primary step of photosynthesis.

  • * To whom correspondence should be addressed. E-mail: giulio.cerullo{at}

  • Present address: “Light and Control,” PRESTO/JST, Department of Physics, Graduate School of Science, Osaka City University, Osaka, Japan.

View Full Text

Stay Connected to Science