English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

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

MPS-Authors
/persons/resource/persons15791

Scholz,  M.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for biophysical chemistry, Max Planck Society;

Fulltext (public)

1855097.htm
(Publisher version), 2MB

Supplementary Material (public)

1855097_Suppl_1.pdf
(Supplementary material), 194KB

Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-A9AB-E
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.