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- W2020721852 abstract "Measurements have been made of the extent of polarization in the fluorescence light from glycerine solutions of uranine and rhodamine-B. The results indicate that the fluorescence light is polarized to the same extent throughout any one fluorescence band; or, if there is a variation which these experiments have failed to detect, it cannot be much greater than one percent. These results thus confirm the observations of Wawilow and of Pringsheim and Wawilow. In the case of uranine the width of the fluorescence band is such that the frequency at the short-wave edge exceeds that at the long-wave side by more than twenty-five percent. The results therefore add support to the view that a fluorescence band is to be regarded as a unit. This view is still further strengthened by the fact that under some conditions of concentration there is evidence of the existence of two bands in the fluorescence spectrum of uranine, the polarization being constant throughout each band but different for the two bands.If we adopt the usually accepted explanation of the cause of polarization in viscous solutions the results are best explained by the assumption that the duration of the fluorescence process is the same for all wave-lengths in a fluorescence band and that the duration is less for the small band of uranine than for the principal band. If this explanation is correct it may still be that the broad fluorescence band of uranine is really a group of overlapping lines; but if so the duration of the excited state is the same for all lines of the group. An alternative view, with which these results are altogether consistent, is that discussed by one of the writers in a previous paper, viz. that only a single electron transition is involved, and that the breadth and shape of the fluorescence band are determined by the disturbing effect of the solvent." @default.
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- W2020721852 date "1930-10-15" @default.
- W2020721852 modified "2023-09-27" @default.
- W2020721852 title "The Polarized Fluorescence of Solutions of Rhodamine-B and Uranine" @default.
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- W2020721852 doi "https://doi.org/10.1103/physrev.36.1386" @default.
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