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- W2051257751 abstract "β-Carotene exhibits the 1 B u + → 3 A g - diabatic excitation followed by stimulated-emission from the 3 A g - and 1 B u - states when the C 2 h symmetry of electronic structure is lowered by polarization. Upon-excitation, with subpicosecond pulses, to the pair of overlapped optically-allowed 1 B u + (1) and optically-forbidden 3 A g - (2) levels (‘diabatic levels’), we observed stimulated-emission from five diabatic levels, above and below the original pair, which included 1 B u - (1), 3 A g - (0), 3 A g - (1), 3 A g - (2) and 3 A g - (3). We ascribed this to diabatic excitation followed by radiative transitions between the 3 A g - and 1 B u + (or 1 B u - ) vibronic levels in aggregates. The number of observed stimulated-emission peaks increased from two to five in n -hexane on going from all- trans - to 15- cis -β-carotene, and in all- trans -β-carotene from non-polar to polar solvent, which we ascribed to configurational change and electronic polarization in the conjugated chain." @default.
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- W2051257751 date "2008-03-01" @default.
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- W2051257751 title "Excitation followed by stimulated-emission from diabatic levels in all-trans- and 15-cis-β-carotenes: Effects of molecular symmetry and solvent polarity" @default.
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- W2051257751 doi "https://doi.org/10.1016/j.cplett.2008.02.024" @default.
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