Characteristic Fluorescence Spectra of Highly Concentrated Pyrene Solutions in n-Paraffins at 77 K
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概要
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Effects of two different refreezing processes have been investigated on the fluorescence spectrum of refrozen pyrene solutions in n-heptane and n-hexane in a wide range of concentration. It has been found that the refreezing process gives significant changes in the fluorescence spectrum of the samples with pyrene concentration of above 4×10<SUP>-3</SUP> M/M. One of the refreezing processes produces the excimer fluorescence band in addition to the quasiline series which is not so much influenced by the refreezing. In the fluorescence spectrum produced by the other refreezing process the short wavelength portion is a quasiline series shifted as a whole to blue as compared with the quasiline series produced by the former refreezing process, whereas the long wavelength portion consists of several bands in the region. between 4500 and 4900Å.
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