Photofragmentation ofC60Molecules following Resonance Excitation and Ionization near the C1sEdge

Fragmentation spectra of ${\mathrm{C}}_{60}$ molecules after selective resonant excitation and ionization of C $1s$ electrons have been found to differ remarkably. At the ${\pi }^{*}$ preedge resonances the multiply charged ions show strong fragmentation. Above the $1s$ threshold the ${\mathrm{C}}_{60}^{+}$ ion yield indicates that the slow photoelectrons can get recaptured. Relative fragmentation of the parent ${\mathrm{C}}_{60}^{+}$ ions has been found to increase strongly above the threshold towards a maximum of about 20 eV kinetic energy of the photoelectron; this may be due to the excitation of the giant plasmon resonance.