Vibrational relaxation and internal conversion in the overlapped optically-allowed 1Bu+ and optically-forbidden 1Bu- or 3Ag- vibronic levels of carotenoids: Effects of diabatic mixing as determined by Kerr-gate fluorescence spectroscopy

After vibrational relaxation with the 1Bu++1Bu-(3Ag-) simultaneous emission, the 1Bu-(3Ag-) internal conversion takes place in neurosporene (lycopene).