Femtosecond excited-state dynamics of fullerene-C nanoparticles in water.

Femtosecond excited-state dynamics of fullerene-C nanoparticles (nC) having a mean size of 50 nm dispersed in pure water was studied by means of femtosecond transient absorption spectroscopy. The intermolecular charge-transfer (CT) excited state in solid C was directly and firstly observed by femtosecond 350 nm and 420 nm excitations, and its intrinsic lifetime of 0.35 ps was found.