Fast and slow fluorescence emissions from pyrimidine vapor |
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Authors: | Katsuo Uchida Iwao Yamazaki Hiroaki Baba |
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Institution: | Division of Chemistry, Research Institute of Applied Electricity, Hokkaido University, Sapporo 060, Japan |
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Abstract: | The pressure and excitation-energy dependence of the fluorescence quantum yield and lifetime of pyrimidine vapor has been investigated in the pressure range 10?3-10 torr. The results indicate that in conformity to the intermediate case the fluorescence of the isolated pyrimidine molecule consists of fast and slow components with lifetimes of the order of 1 ns and 10 μs, respectively. The total fluorescence quantum yield amounts to as high as 0.045. The yield of the slow fluorescence component decreases significantly with increasing excitation energy; this observation is interpreted as being due mainly to the lengthening of the radiative lifetime of that component. |
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