Abstract
Low-temperature single crystal Raman spectra are presented for the organic ferromagnetic insulator TDAE-C 60. The mode intensities, lineshifts, linewidths and depolarization ratios are compared with alkali-doped fullerene materials and with pure C 60. A comparison of visible laser light excited spectra (E exc. = 2.41 eV) with infrared excited Raman measurements (E exc. = 1.17 eV) shows a selective resonance effect whereby in the visible, a frequency shift of only t he tangential modes is observed, while in the infraredwhich is resonant with the t m1u → t 1g electronic transition —also the radial modes are observed to shift. The effect is attributed to Raman resonance with different relaxed states of C 60 anion.
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