Photoionization of Fullerene Ions of Various Mass in the Energy Range of the Giant Plasmon Excitations

A systematic study of single photoionization of fullerene ions was conducted at ALS to examine the dependence of the cross sections on fullerene mass.~ Present single ionization measurements of C$_{40}^{+}$, C$_{50}^{+}$, C$_{60}^{+}$, and C$_{70}^{+}$ are combined with previous measurements for C$_{80}^{+}$ and C$_{84}^{+}$ to examine the mass-dependent behavior of the giant plasmon resonances in the 18 eV to 72 eV energy range.~ Both the surface plasmon and volume plasmon resonances are identified and compared to determine whether simple scaling relations may be used to predict the behavior of other fullerenes.~ Initial analysis indicates a correlation between fullerene ion mass and the location and strength of these plasmon resonances.