Die Energieausbeute der Fluoreszenzstrahlung von Fluoreszeinl�sungen bei antistokesscher Erregung

Valentiner, Siegfried; Rössiger, M.

doi:10.1007/bf01380125

Cited by 6 publications

(1 citation statement)

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“…Vavilov found 7 total fluorescence and absorption to be proportional for an aqueous solution of fluorescein; but results similar to those described here were found by Valentiner and Rossiger. 8 These results would all find qualitative explanation if there were in reality two fluorescence bands of invariable form with maxima close together, one being a broad band with a broad excitation curve having its maximum around 4730 and the other a narrower but stronger band with a narrow excitation curve at about 5000A.…”

Section: Fluorescence Excitation and Absorption Curvesmentioning

confidence: 88%

The Excitation of Fluorescence in Fluorescein

Kennard¹

1927

Phys. Rev.

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Fluorescence in violation of Stokes' law, excited in an alcoholic solution of specially purified fluorescein, was compared by a photoelectric method with the reciprocal emission when fluorescent and exciting wave-lengths are interchanged. The following theoretical equation, recently proposed by the author, was found to be largely verified: f yx /fxy = ^xJy/\Jx. Here/ is the exciting power, i.e. fyxdXy is the emission of fluorescent energy from unit volume in the wave-length range d\ y when the fluorescing substance is illuminated with unit density of exciting radiation of wave-length \ x , f xy is the same thing with the wave-lengths interchanged, and J x , J v are the densities of black-body radiation for these two wave-lengths at the temperature of the fluorescing substance. A peculiar interest attaches to this equation because it contains no unknown constants.Fluorescence, excitation and absorption curves for the same fluorescein were also determined with moderate accuracy. The fluorescence curves show a single maximum around 5240A but change shape as the exciting wave-length is varied. The excitation curve for fixed incident energy shows a maximum around 5000 for fluorescence at 5270; for other points in the fluorescence spectrum the maximum excitation occurs at shorter wave-lengths, e.g. at 4730 ± 80A for fluorescence at 5009 or 5582. The curves suggest two superposed bands of different width but with almost coincident peaks. The maximum absorption occurs around 4750.

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Section: Fluorescence Excitation and Absorption Curvesmentioning

confidence: 88%