Photoexcitation of a volume plasmon in C60 ions.
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.
Scully
S W J
SW
Department of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USA.
Emmons
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Gharaibeh
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Phaneuf
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Kilcoyne
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Schlachter
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Schippers
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Müller
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Chakraborty
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Madjet
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Rost
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