Abstract
The manifestations of vibronic coupling responsible for the magnetic circular dichroism (MCD) A terms in the region of the lowest excited state of C 60 have been examined through quantum-mechanical semi-empirical calculations. The vibronic sequences present both in the MCD and in the fluorescence spectrum are attributed to interactions of a low-lying T 1g state with higher permitted T 1u states through t 1u and h u modes. The main vibrational modes responsible for the borrowing are examined and a rationale for the sign shown by the MCD bands is provided.
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