. Carnegie Institution of Washington publication. STUDIES IN LUMINESCENCE. (about n) remains constant for all dilutions. The shift in the observed fluoresence maximum is therefore due entirely to absorption. This fixed position of maximum fluorescence seems to be consistent with the theory of ionization. According to Buckingham, ions may have some of the same optical properties as other substances and fluorescence C ISO 100 50 0) > A ^^x \pr-r. Fig. 35- Fig. 36. Sp Variation in intensity of observed fluorescence from 1 mm. section transmitted through different thickn
. Carnegie Institution of Washington publication. STUDIES IN LUMINESCENCE. (about n) remains constant for all dilutions. The shift in the observed fluoresence maximum is therefore due entirely to absorption. This fixed position of maximum fluorescence seems to be consistent with the theory of ionization. According to Buckingham, ions may have some of the same optical properties as other substances and fluorescence C ISO 100 50 0) > A ^^x \pr-r. Fig. 35- Fig. 36. Sp Variation in intensity of observed fluorescence from 1 mm. section transmitted through different thicknesses of solution. Fluorescence corrected for absorption by graphical method. Concentration = {. 15 10 is one of these properties. If only the ions fluoresce the position of maxi- mum fluorescence would evidently remain constant whether the material of the solution were all ionized or not. This fixed position of maximum fluorescence is also consistent with the theory suggested in Chapter I,1 that fluo- rescence is caused by an unusual kind of dissociation similar to that produced in a gas by the action of Roentgen rays. That part of the solution which, during the process of change, produces fluorescence does not give evidence of any effect due to material not dissociated beyond that of absorption. SUMMARY. The results of the above investigation upon resorufin, as a typical fluorescent substance, taken in connection with the work of B. Walter and with the experiments described in Chapter I, seem to establish the truth of the following statements: 1. Fluorescent solutions are optically perfect substances,/, c, they obey Lambert's law. 2. Beer's law, i. c, that increase of concentration is equivalent to increase in thickness, is true for dilute but not for concentrated solutions. 3. A change in the concentration of a fluorescent solution has no effect upon the typical fluorescence spectrum. 'Nichols and Merritt, Physical Review, xix, No. 1, 1904; xxir, No. 5, 1906. B I'- ll D ly f
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