Cross sections for photoionization of fullerene molecular ions Cn+ with n = 40, 50, 70, 76, 78, and 84

C. M. Thomas, K. K. Baral, N. B. Aryal, M. Habibi, D. A. Esteves-Macaluso, A. L.D. Kilcoyne, A. Aguilar, A. S. Schlachter, S. Schippers, A. Müller, R. A. Phaneuf

Research output: Contribution to journalArticlepeer-review

Abstract

Absolute cross-section measurements are reported for single photoionization of Cn+ 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 Cn+ molecular ions with a beam of monochromatized synchrotron radiation and measuring the yield of Cn2+ 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 C60 and may be attributable to a harmonic of the dominant surface-plasmon resonance near 23 eV.

Original languageEnglish
Article number053412
JournalPhysical Review A
Volume95
Issue number5
DOIs
StatePublished - May 22 2017

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