Lifetimes of vibrationally excited triplet alkylbenzenes studied by two-color photoionization

1987 ◽  
Vol 91 (13) ◽  
pp. 3499-3503 ◽  
Author(s):  
H. G. Loehmannsroeben ◽  
K. Luther ◽  
M. Stuke
Keyword(s):  
Vibrationally Excited ◽  
Excited Triplet

Spectrofluorometric studies. VIII. The effect of CO2 and CHCl3 on the photochemistry of monofluorobenzene

1970 ◽  
Vol 48 (10) ◽  
pp. 1607-1613 ◽  
Author(s):  
M. E. MacBeath ◽  
I. Unger
Keyword(s):  
Quantum Yield ◽  
Quantum Yields ◽  
Vibrationally Excited ◽  
Excited Triplet ◽  
Improved Technique ◽  
Triplet Quantum Yields

The sensitized emission of biacetyl technique was used to study the effect of CHCl3 and CO2 on the triplet quantum yields of both benzene and monofluorobenzene.The monofluorobenzene was studied at λ excitation (λex) of 2470, 2590, and 2670 Å. At 2470 Å, the triplet yield increased by over 40% with both added gases; at λex 2590 Å, by around 30%; and at λex 2670 Å, about 20%. CHCl3 is slightly more effective than CO2 in enhancing the biacetyl phosphorescent yield. The quantum yield of fluorescence was unchanged with these added gases. Using a slightly improved technique, the comparison irradiation of a benzene–biacetyl mixture at λex 2540 Å with added CHCl3 was repeated. The results confirmed that the biacetyl phosphorescent yield decreased with increasing pressures of CHCl3, but suggest that the effect is not as great as previously reported. At the same wavelength, the triplet yield is unaffected by the addition of CO2. The quantum yield of fluorescence of benzene is virtually unaffected by the added gases. The data suggest that in the monofluorobenzene case the CO2 and CHCl3 are quenching vibrationally excited triplet fluorobenzene molecules.

Collisional deactivation of vibrationally excited triplet molecules of fluorenone

1991 ◽  
Vol 55 (4) ◽  
pp. 1011-1015
Author(s):  
G. A. Zalesskaya ◽  
A. E. Gololobov ◽  
D. L. Yakovlev ◽  
V. T. Pavlova
Keyword(s):  
Vibrationally Excited ◽  
Excited Triplet
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