We study the intensity dependence of ionization and fragmentation of buckminsterfullerene (C60) in strong laser fields. Our data provide strong evidence that at intensities ≤1014 W/cm2 these processes occur predominantly via multiphoton excitation of the 20 eV plasmon resonance of C60. At least two plasmons have to be created to initiate fragmentation or multiple ionization.

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Journal Phys. Rev. Lett.
Hunsche, S, Starczewski, T, L'Huillier, A, Persson, A, Wahlström, C. -G, van Linden van den Heuvell, H. B, & Svanberg, S. (1996). Ionization and fragmentation of C60 via multiphoton-multiplasmon excitation. Phys.Rev.Lett., 77, 1966–1969.