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Time-Resolved Epr Study of 3C60 in Solid Matrices
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Using time-resolved cw EPR and pulsed EPR techniques, a study was made of the characteristics of the photoexcited triplet state of C60 adsorbed in silica gel pores and embedded in a polymethylmethacrylate matrix. It was found that the time-resolved spectra from 3C60 in these matrices at room temperature retain the absorption/emission features of spectra from 3C60 in frozen solution ( 120 K). Apparently, the combination of molecular rotation and pseudo rotation (resulting from interconversion between Jahn-Teller states) is not fast enough to lead to complete averaging of the dipole-dipole interaction between the unpaired electrons. The study explored the effect of introduction of solvent molecules in the silica gel pores on the 3C60 spectrum and quenching of the triplet by electron donors.
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