Interpretation of the vibrational structure of the emission and absorption spectra of C60

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Abstract
The vibronic intensity borrowing activity of the lowest electronically excited singlet states of C60 has been obtained through quantum chemical calculations. The vibrational structure of the UV–visible spectra is found to be dominated by false origins. The calculated intensities of the false origins of the T 1g state agree with the vibrational structure observed in the fluorescencespectrum. The same false origins are recognized to be responsible for the vibrational structure of the red edge portion of the absorptionspectrum. Only two bands in the spectra are assigned as combination bands involving an a g or a Jahn–Teller active mode. Absorption bands that may be associated with false origins of the states T 2g and G g which are quasidegenerate with S 1 are tentatively assigned.