Abstract
The polarization of the charge-transfer (CT) fluorescence excited in the charge-transfer and donor absorption band was measured for the complexes of tetracyanoethylene with benzene, toluene, ortho- and para-xylene, and those of s-trinitrobenzene and tetrachlorophthalic anhydride with anthracene in organic glass at 77°K. It was shown that (1) the fluorescence excited in the CT band is positively polarized, the degree of polarization (P) depending on the complex stability; (2) in the case of a single CT absorption band, P is independent of the wavelength of the exciting light and the case in that of a double absorption band, P is different for any subband; (3) polarization of the fluorescence excited in the donor intramolecular absorption band is negative or zero. These results are discussed on the basis of a model of a partially disoriented complex.
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