PHOTOSELECTED MOLECULES AND APPARENT RELATIVE EMISSION QUANTUM $YEILDS^{*}$
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Date
1964
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Ohio State University
Abstract
The luminescence of rigidly held solute molecules, excited by unpolarized light, is often polarized. The emitting molecules are said to be $photoselected^{1}$ and are not randomly oriented. Thus both the intensity and polarization of the emission observed depend upon the relative orientation of the detector, the exciting wavelength, and the relationship between the absorbing and emitting molecular axes. Consideration of these factors requires a critical examination of the usual determinations of, for example, the relative quantum yields of fluorescence and phosphorescence, the dependence of an emission quantum yield on the exciting wavelength, and the emission band contours. It is predicted that most such determinations are in error whenever the luminescing molecules are not free to rotate. Examples, errors, and corrections are given.
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$^{\ast}$ Supported in part by a grant and a fellowship from the National Science Foundation. $^{1}$ A. C. Albrecht, J. Mol. Spectroscopy 6, 84 (1961)
Author Institution: Gates and Crellin Laboratories of Chemistry, California Institute of Technology; Department of Chemistry, Cornell University
Author Institution: Gates and Crellin Laboratories of Chemistry, California Institute of Technology; Department of Chemistry, Cornell University