Abstract
DR. SELINGER has directed attention to an unintentional ambiguity in our original communication. In comparing the fluorescence spectrum Z of the mixed solution, containing equimolar concentrations of A and B, with the sum (A + B) of the fluorescence spectra of the two separate solutions of A and B, the relative quantum intensities of the monomer components of Z and (A + B) were normalized. Reference to this standard procedure, which has been followed in other reports1 of excimer fluorescence spectra from these laboratories, was unfortunately omitted. The ratio of the quantum yield of excimer fluorescence ID to that of monomer fluorescence IM is given by2: where c is the molar concentration, ch is the ‘half-value’ concentration, and qM and qD are the monomer and excimer fluorescence quantum efficiencies at c = 0 and c = ∞, respectively. For the normalized spectra, the excimer fluorescence intensity is proportional to ID/IM and hence to c. For the unnormalized spectra, ID and IM vary non-linearly with c, according to the Stern–Volmer relations2. Our original data3, prior to normalization, agree closely with those reported by Selinger. They substantiate the conclusion, implicit in our previous communication, that mixed dimers of similar compounds are formed with the same probability and fluorescence quantum efficiency as the pure dimers.
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Birks, J. B., and Christophorou, L. G., Nature, 194, 442 (1962) ; Spectrochim. Acta, 19, 401 (1963); Proc. Roy. Soc., A, 274, 552 (1963); Proc. Roy. Soc., A, 277, 571 (1964).
Birks, J. B., Dyson, D. J., and Munro, I. H., Proc. Roy. Soc., A, 275, 575 (1963).
Christophorou, L. G., Ph.D. thesis, Univ. Manchester (1963).
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BIRKS, J. Fluorescence of Organic Mixed Excimers. Nature 203, 1063 (1964). https://doi.org/10.1038/2031063a0
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DOI: https://doi.org/10.1038/2031063a0
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