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• W1989147989 abstract "Singlet ${}^{1}{B}_{u}$ exciton relaxation in polydiacetylene chains isolated in their crystalline monomer matrix is studied by subpicosecond pump-probe experiments. Results on photoinduced absorption (PA) and on ${}^{1}{B}_{u}$ exciton absorption bleaching [photobleaching (PB)] are presented. It is shown that three excited states lie in the optical gap, apart from the triplet ${}^{3}{B}_{u}$ exciton. Two short-lived states (respective lifetimes ensuremath{tau}ensuremath{approx}450 fs and 2 ps) of very similar PA cross sections and PB efficiencies, belong to the same relaxation pathway. A third longer-lived state (ensuremath{tau}ensuremath{geqslant}30 ps) is responsible for a slow PB component and exists independently of the triplet exciton, which has its own signature [B. Kraabel et al., Chem. Phys. 227, 83 (1998)]. There is a branching in the ${}^{1}{B}_{u}$ exciton relaxation, excluding a single cascade of these three states. The proposed nonradiative relaxation scheme involves two ${A}_{g}$ states. Self-trapping is also discussed and it is concluded that, if present, it cannot be instantaneous. Our data suggest that self-trapping is at best a minor component of the ${B}_{u}$ singlet exciton relaxation in polydiacetylene isolated chains." @default.
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• W1989147989 date "1998-12-15" @default.
• W1989147989 modified "2023-10-18" @default.
• W1989147989 title "Singlet exciton relaxation in isolated polydiacetylene chains studied by subpicosecond pump-probe experiments" @default.
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• W1989147989 doi "https://doi.org/10.1103/physrevb.58.15777" @default.
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