Photoexcitation of a Volume Plasmon in C60 Ions

Authors

S. W. J. Scully, University of Nevada - Reno
E. D. Emmons, University of Nevada - Reno
M. F. Gharaibeh, University of Nevada - Reno
R. A. Phaneuf, University of Nevada - RenoFollow
A. L. D. Kilcoyne, Lawrence Berkeley National LaboratoryFollow
A. S. Schlachter, Lawrence Berkeley National LaboratoryFollow
S. Schippers, Institut für Atom-und Molekülphysik
A. M. Müller, Institut für Atom-und Molekülphysik
H. S. Chakraborty, Max Planck Institute for the Physics of Complex Systems
M. E. Madjet, Max Planck Institute for the Physics of Complex Systems
J. M. Rost, Max Planck Institute for the Physics of Complex Systems

Date of this Version

2005

Citation

Physical Review Letters 94, 065503 (2005); DOI: 10.1103/PhysRevLett.94.065503

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.