Time-correlated single-photon counting experiments at 2 25 ps resolution have been used to measure the S, fluorescence decay time of xanthione in different fluid solvents. Systematic differences in Sz lifetime in the range 20-30 ps are revealed for a homologous series of n-alkane solvents, and an in
S2 → S0 fluorescence in an aromatic thioketone, xanthione
✍ Scribed by J. Robert Huber; Mary Mahaney
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 397 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0009-2614
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Picosecond exitation of tile 28 250 cm-' overtone band in the \*(r. a\*) manifold o'transnzobenzcne yields an emission spectrum with ;1 prominent Sz -+ SO Ruorescrncc band in addition to an S1 \* SO component from the '(IX,=\*) manifold. The Sz -+ So ftuorescence decay time at 420 nm is f 5 Ps.
An anomalous fluorescence with a quantum yield of 0.017 near BOO0 cm-' is detected from he?rane solutions of aceanthrylene. Excitation and synchronous scan spectra verify that the second acited state with a lifetime of 43 ns is the source of the fluorescence. The absorption spectrum is simulated by