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  Assignment of carotene S* state features to the vibrationally hot ground electronic state.

Lenzer, T., Ehlers, F., Scholz, M., Oswald, R., & Oum, K. (2010). Assignment of carotene S* state features to the vibrationally hot ground electronic state. Physical Chemistry Chemical Physics, 12(31), 8832-8839. doi:10.1039/B925071A.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-A9AB-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-C61B-7
Genre: Journal Article

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Lenzer, T., Author
Ehlers, F., Author
Scholz, M.1, Author              
Oswald, R., Author
Oum, K., Author
Affiliations:
1Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for biophysical chemistry, Max Planck Society, ou_578564              

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 Abstract: The so-called S* state has been suggested to play an important role in the photophysics of β-carotene and other carotenoids in solution and photosynthetic light-harvesting complexes, yet its origin has remained elusive. The present experiments employing temperature-dependent steady-state absorption spectroscopy and ultrafast pump-supercontinuum probe (PSCP) transient absorption measurements of β-carotene in solution demonstrate that the spectral features of S* are due to vibrationally excited molecules in the ground electronic state S0. Characteristic spectral signatures, such as a highly structured bleach below 500 nm and absorption in the range 500–660 nm result from the superposition of hot S0 absorption (“S0*”) on top of the ground-state bleach of room-temperature molecules. Appearance and disappearance of the S0* molecules can be completely described by a global kinetic analysis employing time-dependent species-associated spectra without the need to invoke the population of an intermediate electronically excited state.

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Language(s): eng - English
 Dates: 2010-06-07
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1039/B925071A
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Title: Physical Chemistry Chemical Physics
Source Genre: Journal
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Pages: - Volume / Issue: 12 (31) Sequence Number: - Start / End Page: 8832 - 8839 Identifier: -