TY - JOUR A1 - Reimers, Jeffrey R. A1 - Biczysko, Malgorzata A1 - Bruce, Douglas A1 - Coker, David F. A1 - Frankcombe, Terry J. A1 - Hashimoto, Hideki A1 - Hauer, Jürgen A1 - Jankowiak, Ryszard A1 - Kramer, Tobias A1 - Linnanto, Juha A1 - Mamedov, Fikret A1 - Müh, Frank A1 - Rätsep, Margus A1 - Renger, Thomas A1 - Styring, Stenbjörn A1 - Wan, Jian A1 - Wang, Zhuan A1 - Wang-Otomo, Zheng-Yu A1 - Weng, Yu-Xiang A1 - Yang, Chunhong A1 - Zhang, Jian-Ping A1 - Freiberg, Arvi A1 - Krausz, Elmars T1 - Challenges facing an understanding of the nature of low-energy excited states in photosynthesis T2 - BBA Bioenergetics N2 - While the majority of the photochemical states and pathways related to the biological capture of solar energy are now well understood and provide paradigms for artificial device design, additional low-energy states have been discovered in many systems with obscure origins and significance. However, as low-energy states are naively expected to be critical to function, these observations pose important challenges. A review of known properties of low energy states covering eight photochemical systems, and options for their interpretation, are presented. A concerted experimental and theoretical research strategy is suggested and outlined, this being aimed at providing a fully comprehensive understanding. Y1 - 2016 UR - https://opus4.kobv.de/opus4-zib/frontdoor/index/index/docId/5975 VL - 1857 IS - 9 SP - 1627 EP - 1640 ER -