The quantum yield ratio r=& +&+ . , ofthe &-So and +S, fluorescences from azulene has been redetermined. With azulene in isopentane at 190 K, r=455 & 100. This value agrees with the lower limit, given by Huppert, Jortner and Rentzepis, but is an order of magnitude lower than that given by Gillispie
Fluorescence quantum yields of S1, benzene in the channel 3 region
โ Scribed by Minoru Sumitani; Desmond O'Connor; Yoshihiro Takagi; Nobuaki Nakashima; Keiji Kamogawa; Yasuo Udagawa; Keitaro Yoshihara
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 454 KB
- Volume
- 97
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
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๐ SIMILAR VOLUMES
The lifetimes of 9,10\_diphenylantllracenein dilute solutions ol cyclotexane and benzene at 25ยฐC have been found to k 7.58 2 0.04 and 6.95 \* 0.04 ns respccrively. hleasuwmcnts of the relative quanrun yields>how that the dependenca ': \_: on the solvent is caused by an incseased piobnbility for rmnk
## Time-rcsolvcd lluoresccncc spectra and decay times of the 7l lpr vibronic bands were observed under bulb and cold beam conditions. The unique properlies of these bands compared with other vibronic bands and their bearing on the mcclw~ism of channel three rare discussed.
The quantum yield for the O2 '$-+%g radiative transition was determined in benzene by comparison of the singlet oxygen phosphorescence at 1275 nm, sensitized by 9,1O\_dicyanoanthracene, with the fluorescence of five different dyes emitting in the same spectral region. A value of Qp= (2.5+ 1.3) x 10m
A new instrument intended for the measurement of relative fluorescence quantum yields is described. This instrument incorporates an integrating sphere to eliminate corrections due to polarization and to index of refraction phenomena. The primary standard was quinine bisulphate in 1'N H2SO4. Quantum
The resonance-enhanced two-photon ionization (REZPI) spectrum of S, benzene was studied by time-of-flight (TOF) mass analysis. Excitation spectra of the mass-selected ion (C,H$ ) measured over the wavelength region from 233 to 262 nm revealed that the ion intensity for the "channel three" region exc