We report Shpol'skii-type luminescence spectra of C-70 in n-pentane at 1.5 K with vibronic linewidths of 3 cm(-1). The vibronic structure of both fluorescence and phosphorescence has been... Show moreWe report Shpol'skii-type luminescence spectra of C-70 in n-pentane at 1.5 K with vibronic linewidths of 3 cm(-1). The vibronic structure of both fluorescence and phosphorescence has been unravelled. The fluorescence intensity largely shows up in vibronic bands corresponding to transitions to ground-state infrared-active vibrational modes and it is concluded that the first excited singlet state of C-70 in alkanes is of A'(2) character. Show less
Heuvel, D.J. van den; Berg, G.J.B. van den; Groenen, E.J.J.; Schmidt, J.; Holleman, I.; Meijer, G. 1995
The fluorescence and fluorescence-excitation spectra of C-60 in a hydrocarbon glass at 1.2 K are reported. The fluorescence spectrum resembles that of a molecular X-trap in crystalline C-60. The... Show moreThe fluorescence and fluorescence-excitation spectra of C-60 in a hydrocarbon glass at 1.2 K are reported. The fluorescence spectrum resembles that of a molecular X-trap in crystalline C-60. The vibronic bands in these spectra are assigned, and the intensity distribution among the false origins points to vibronic coupling within the singlet manifold. The lowest excited singlet state of C-60 shows predominantly T-1g and G(g) character. Additionally, we show that a reduction of the symmetry of C-60 by either an intra- or an intermolecular perturbation leads to a fluorescence spectrum with a strong 0-0 transition and a different vibronic structure. Show less
