The blue and red fluorcscencc of cryptocyanine colutions Wits observed under conditions of steady-stay light evcltation and during Q-swttched ruby her cxitation. Experimental results give evidence that tilt blue fiuore~fcncc IS Sz -\* So transition.
S2 → S0 fluorescence in trans-azobenzene
✍ Scribed by C.G. Morgante; W.S. Struve
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 443 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
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.
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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
drrr tizssberg. 3400 Corringen. Federal Republic of Germany A d&> cd lluorc,cence S2 -So from the second exited singlet state (Sz) of4.6,8-trimethylazulene (TMA), resulting lrum tlolrlo-triplet-triplcr annihilation Tt + Tt --S2 + So, has been observed. No delayed fluorescence from an upper es-r~mcr
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
Ln the spectrum of the delayed fluorescence (DF) of pyrene, caused by triplet-triplet anndulation Tt + Tt -, Sn + SO (II = 1.2). a strong DT St -r SO and a very weak DF Sz \* SO are observed. The DF S1 -t SO IS quenched seletively by cornpounds hhe Nðylaniline or trrethylamme which do not quench