Photoexcitation of a volume plasmon in C60 ions

• Published in: Physical review letters 2005-06, Vol.94 (6), p.065503.1-065503.4
• Main Authors: SCULLY, S. W. J, EMMONS, E. D, ROST, J. M, GHARAIBEH, M. F, PHANEUF, R. A, KILCOYNE, A. L. D, SCHLACHTER, A. S, SCHIPPERS, S, MÜLLER, A, CHAKRABORTY, H. S, MADJET, M. E
• Format: Article
• Language: English
• Subjects: ABSORPTION; Atomic and molecular clusters; ATOMIC AND MOLECULAR PHYSICS; C60 photoionization fullerene volume plasmon; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Electron and ion emission by liquids and solids; impact phenomena; ELECTRONS; ENERGY RANGE; Exact sciences and technology; FULLERENES; Fullerenes and fullerene-related materials; FUNCTIONALS; GEOMETRY; GIANT RESONANCE; Molecular properties and interactions with photons; Molecular spectra; Photoemission and photoelectron spectra; PHOTOIONIZATION; PHOTONS; Physics; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Plasma and collective effects in clusters; PLASMONS; Polymers; organic compounds; RESONANCE; Structure of solids and liquids; crystallography; Studies of special atoms, molecules and their ions; clusters; Vacuum ultraviolet spectra
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.94.065503

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 C60(sup+), C60(sup2+), and C60(sup3+) ions in the 17 75eV 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.