Time-resolved EPR and Fourier transform EPR study of triplet fullerene C60: determinations of T1 and the carbon-13 hyperfine coupling constant (original) (raw)

Continuous wave (CW) and time-resolved (TR) EPR spectra of triplet Cao with partial and full 13C enrichment in methylcyclohexane solutions after UV irradiation were obtained. Line broadening from 1% satellites was observed. The I3C hyperfine coupling constant was determined to be 0.06 G. Fourier transform EPR (FT-EPR) experiments with a resolution of 20 ns were carried out, and T I was found to be 0.8 f 0.1 p s by fitting the intensity of the free induction decay signal to the modified Bloch equations. The relaxation time from Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, under Contract W-3 1-109-Eng-38. The work at The University of Chicago was supported by NSF Grant CHE-9021-487. DuPont Contribution No. 6472. We thankDr. M. Bowman for help in the FT-EPR experiments, Jerry Hunt for mass spectroscopy assistance, and Steve Hill for technical support in the CW-EPR experiments.