Photoexcitation of a volume plasmon in C60 ions |
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Authors: | Scully S W J Emmons E D Gharaibeh M F Phaneuf R A Kilcoyne A L D Schlachter A S Schippers S Müller A Chakraborty H S Madjet M E Rost J M |
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Institution: | Department of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USA. |
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Abstract: | Neutral C60 is well known to exhibit a giant resonance in its photon absorption spectrum near 20 eV. This is associated with a surface plasmon, where delocalized electrons oscillate as a whole relative to the ionic cage. Absolute photoionization cross-section measurements for C+60, C2+60, and C3+60 ions in the 17-75 eV energy range show an additional resonance near 40 eV. Time-dependent density functional calculations confirm the collective nature of this feature, which is characterized as a dipole-excited volume plasmon made possible by the special fullerene geometry. |
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