Fluorescence from higher excited states. The decacyclene mononegative ion
โ Scribed by C.J.M. Brugman; R.P.H. Rettschnick; G.J. Hoytink
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- English
- Weight
- 401 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0009-2614
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๐ SIMILAR VOLUMES
The decacyclene mono-negative ion shows a quartet-doublet phosphorescence in rigid 2-MTHF at Liquid nitrogen temperature. The actual lifetime of the quartet state is 2.6msec.
Very weak fluorescence in the ultaviolet (210-380 nm) is observed when an anthracene crystal is excited at 397 nm. They are assigned as fluorescence from S2 and S1 states in the crystal. These higher excited states are populated by fusion of two S, excitons.
We examine a report that emission can be observed from excited states of the uranyl ion, above that giving the usual green emission, in the light of new measurements. We can find no firm evidence for emission from such states.
With 1,2-benzanthracene and fluoranthene population of higher excited singlet states S,, (n > 1) by triplet-triple1 annihilation is energetically possible. With both compounds a delayed fluorescence Sn + So from the highest accessible singlet state St1 was found (n = 3 for 1,2-benzanthracene and n =