  The radiation-induced fragmentation of the C60 fullerene was investigated by
the tight-binding electron-ion dynamics simulations. In intense laser field,
the breathing vibrational mode is much more strongly excited than the
pentagonal-pinch mode. The fragmentation effect was found more remarkable at
long wavelength lambda>800 nm rather than the resonant wavelengths due to the
internal laser-induced dipole force, and the production ratio of C and C2
rapidly grows with increasing wavelength. By such fragmentation law, C atoms,
C2 dimers or large Cn fragments could be selectively obtained by changing the
laser wavelength. And the fragmentation of C60 by two laser pulses like the
multi-step atomic photoionization was investigated.
