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Pulsed EPR on the photoexcited triplet state of C60 fullerene

✍ Scribed by M. Bennati; A. Grupp; M. Mehring; K.P. Dinse; J. Fink

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 384 KB
Volume: 200
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(92)80072-j

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✦ Synopsis

We report on the observation of two different triplet states in photoexcited C, fullerene molecules. The following fine structure parameters were determined from spectral fits to the triplet powder spectrum: IDI [=0.0117 cm-' (12.5 mT), lJ&l=O.O014 cm-' (1.5 mT) and / D2j ~0.0047 cm-' (5 mT), l&l =O.O cm-'. Below 10 Kmainly triplet 1 was observed, whereas triplet 2 appeared only with increasing temperature. It is thermally activated with an activation energy AE= 17 meV. Due to motional narrowing the parameters D, and E, decrease slightly at higher temperatures. Depopulation kinetics as well as spin-lattice relaxation rates were determined.

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