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Cross sections for photoionization of fullerene molecular ions C-n(+) with n=40, 50, 70, 76, 78, and 84
AuthorThomas, C. M.
Baral, Kiran K.
Aryal, Nagendra B.
Esteves-Macaluso, David A.
Kilcoyne, A. L. D.
Schlachter, A. S.
Phaneuf, R. A.
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Absolute cross-section measurements are reported for single photoionization of C-n(+) fullerene molecular ions (n = 40, 50, 70, 76, 78, and 84) in the photon-energy range 18-70 eV. The experiments were performed by merging a mass and charge selected beam of C-n(+) molecular ions with a beam of monochromatized synchrotron radiation and measuring the yield of C-n(2+) product ions as a function of the photon energy. Oscillator strengths determined by integrating the measured cross sections over this energy range exhibit a linear dependence on n. The cross sections are parametrized by fits to three Lorentzian functions to represent plasmon excitations and a linear function for direct ionization. The highest-energy resonance in the data near 46 eV is similar to that previously observed in single photoionization of C-60 and may be attributable to a harmonic of the dominant surface-plasmon resonance near 23 eV.