The change in fluorescence quantum yield for indole 2s a function of ercitition wavelengg between 250 and 220 run is found to vary with the static dielectric constant of various alcohol-\vater mixtures at 296 K. The supports rhe intermediacy of I CTTS sbte in tile photoionization process.
The effect of oxygen on the fluorescence quantum yields of some coumarin dyes in ethanol
β Scribed by R.F. Kubin; A.N. Fletcher
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 368 KB
- Volume
- 99
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The fluorescence quantum yields of the 7-aminocoumti dyes coumarin 1,102,X3, LD490, and CSF were measured using argon, air, and osygen as cover gases. The results show that, in ethanol, oxygen does quench these dyes and that the fluorescence is signiiicantly improved in some coumarin dyes by the rem&al of oxygen.
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Fluorescence-excitation and quantum-yield spectra were measured along the rotational contours of the O-O and lOa: bands of pyrazme and the O-O band of pyrimidme in the vapor phase at low pressure. A marked variation in quantum yield was observed. The yield spectra for the O-O bands exhiiit a very sh
in ethanol by Koch et al. in 1985 (12), the photophysical The interaction between ZnO ultrafine particles and naphthothiand photochemical properties of colloidal ZnO have been acarbocyanine (NTC) dye in ethanol was investigated by monitorintensively studied (13)(14)(16)(17)(18). Two fluorescence ban