부산대학교 도서관

Near-infrared transitions of the monoanion and monocation radicals of buckminsterfullerene isolated in argon matrixes (C60^±/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 ²Hg ← ²Hu and ²Gg ← ²Hu transitions of C60⁺/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 C60^-/Ar but weak for C60⁺/Ar. The transition from static to dynamic CF-JT effects for C60⁺/Ar gives rise to unusual temperature and magnetic-field dependencies of the MCD.