Near-infrared transitions of the monoanion and monocation radicals of buckminsterfullerene isolated in argon matrixes (C 60 ± /Ar) have been investigated using magnetic circular dichroism (MCD) and absorption spectroscopy, over the temperature range T = 1.6−30 K and magnetic-field range B = 0−4 T. Structure in the origin-band regions of both ions is partially attributed to the occupation of inequivalent matrix sites. The origin bands for the 2 H g ← 2 H u and 2 G g ← 2 H u transitions of C 60 + /Ar are nearly coincident, with the former at higher energy. The ground-state orbital angular momenta of both ions are quenched by crystal-field-stabilized Jahn−Teller (CF-JT) effects. Trapping is strong for C 60 - /Ar but weak for C 60 + /Ar. The transition from static to dynamic CF-JT effects for C 60 + /Ar gives rise to unusual temperature and magnetic-field dependencies of the MCD.
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Langford et al. (1999) studied this question.
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