- Tytuł:
- Excited-state dynamics of overlapped optically-allowed 1Bu+ and optically-forbidden 1Bu- or 3Ag- vibronic levels of carotenoids: Possible roles in the light-harvesting function
- Autorzy:
-
Koyama, Yasushi
Kakitani, Yoshinori
Nagae, Hiroyoshi - Powiązania:
- https://bibliotekanauki.pl/articles/1039760.pdf
- Data publikacji:
- 2012
- Wydawca:
- Polskie Towarzystwo Biochemiczne
- Tematy:
-
optically-allowed (1Bu+) and optically-forbidden (1Bu- or 3Ag-) states
carotenoids with 9-13 conjugated double bonds
incoherent/coherent excitation
overlapped (diabatic) states - Opis:
- Pump-probe spectroscopy after selective excitation of all-trans Cars (n = 9-13) in nonpolar solvent identified a symmetry selection rule of diabatic electronic mixing and diabatic internal conversion, i.e., '1Bu+-to-1Bu- is allowed but 1Bu+-to-3Ag- is forbidden'. Kerr-gate fluorescence spectroscopy showed that this selection rule breaks down, due to the symmetry degradation when the Car molecules are being excited, and, as a result, the 1Bu+-to-3Ag- diabatic electronic mixing and internal conversion become allowed. On the other hand, pump-probe spectroscopy after coherent excitation of the same set of Cars in polar solvent identified three stimulated-emission components (generated by the quantum-beat mechanism), consisting of the long-lived coherent cross term from the 1Bu+ + 1Bu- or 1Bu+ + 3Ag- diabatic pair and incoherent short-lived 1Bu+ and 1Bu- or 3Ag- split incoherent terms. The same type of stimulated-emission components were identified in Cars bound to LH2 complexes, their lifetimes being substantially shortened by the Car-to-BChl singlet-energy transfer. Each diabatic pair and its split components appeared with high intensities in the first component. The low-energy shifts of the 1Bu+(0), 1Bu-(0) and 3Ag-(0) levels and efficient triplet generation were also found.
- Źródło:
-
Acta Biochimica Polonica; 2012, 59, 1; 5-9
0001-527X - Pojawia się w:
- Acta Biochimica Polonica
- Dostawca treści:
- Biblioteka Nauki
Artykuł