Abstract
Over a dozen reports of optically-induced changes of up to a factor of 5 in the absorption cross-section of the C60 molecule at 532 nm1 have prompted us to investigate whether there might be a correspondingly large change in the (in-phase) polarizability of C60 at the same wavelength. Unfortunately for nonlinear optical applications, we have found a negative answer: the change is less than 3% for the polarizability of C60 upon excitation to either the lowest singlet or triplet state. In the course of this investigation, we have made, we believe, a more accurate determination of the absorption cross-sections σS and σT of the lowest excited singlet and triplet states of C60 molecules. This is achieved with a picosecond pump-probe technique not previously applied to C60. Our measurements of the polarizability changes were done with time-delayed degenerate four-wave mixing experiments. Our experiments were performed in a solution of 0.68 g/L of C60 in benzene.
© 1996 Optical Society of America
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