We study electronic Raman scattering of K4C60 exciting at 1.16 eV, which is resonant with the t1u−t1g transition and permits us to observe interband scattering between the non-degenerate t1u and t1u∗ states. We clarify that the band structure of K4C60 is characterised by small a gap of 50 meV between t1u and t1u∗ bands.
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Ruani et al. (1994) studied this question.
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