Abstract
Results of a 1 3 C pulsed electron nuclear double resonance (ENDOR) study at 95 GHz of C 7 0 in its photoexcited triplet state are reported. The C 7 0 molecule of D 5 h symmetry (an approximation for the triplet state) consists of 5 inequivalent types of carbon atoms, which we label 1 at the pole to 5 at the equator. The analysis of the ENDOR spectra reveals that the spin density is not uniformly distributed over the C 7 0 molecule. About 66% of the spin density is on the atoms of type 3, 20% on the atoms of type 4, and 16% on the atoms of type 1, whereas no spin density is found on the atoms of type 2 and 5. The spin-density distribution in the triplet state for C 7 0 is compared with that observed for C 6 0 previously.
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