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Updated: Aug 31, 2025

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Ultrafast laser spectroscopic studies on carotenoids in solution and on those bound to photosynthetic pigment-protein
Hideki Hashimoto1, Chiasa Uragami1, Nao Yukihira1
1Department of Applied Chemistry for Environment, Graduate School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo, Japan.
Abstract:
Carotenoid excited singlet states, in particular, are typically very short lived. Therefore, time-resolved absorption spectroscopy in the time regime from femtoseconds to sub-milliseconds are required to unravel and understand the complicated relaxation and excitation energy-transfer pathways of carotenoids in solution and in photosynthetic pigment-protein complexes. The focus of this chapter is to explain how to use ultrafast time-resolved absorption spectroscopy in carotenoid research. The importance of a systematic approach to understanding the various carotenoid excited states by using a series of carotenoids with different conjugation lengths and the isomers of carotenoids is also emphasized.
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