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- W2050891035 abstract "The population decay time of the first excited singlet state of an aromatic thione, thioxanthione, has been measured for the first time in fluid solution at room temperature, using a laser pump-probe method. The average value of τ(S 1 ) is 0.53±0.12 ps in three solvents, acetonitrile, acetone and 1-octanol giving a nonradiative S 1 decay constant of (1.9 ± 0.4) × 10 12 s −1 . Using these data and a calculated value of the radiative lifetime of S 1 , a quantum yield of S 1 → S 0 fluorescence, φ f < 5 × 10 −8 , is estimated, a value which is consistent with the failure to observe prompt fluorescence in these compounds. The short S 1 lifetime of thioxanthione is attributed to fast S 1 ( 1 A 2 )−T n ( 3 A 1 ) intersystem crossing, which can occur by a first order spin-orbit coupling mechanism because T n ( 3 A 1 ) (n = 1 or 2) has a lower energy than S 1 ( 1 A 2 ) in the polar solvents employed." @default.
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- W2050891035 date "1996-11-01" @default.
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- W2050891035 title "Subpicosecond population decay time of the first excited singlet state of thioxanthione in fluid solution" @default.
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- W2050891035 doi "https://doi.org/10.1016/0009-2614(96)01081-0" @default.
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