Photoexcitation of a Volume Plasmon in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:mn>60</mml:mn></mml:msub></mml:math>Ions
S. W. J. ScullyDepartment of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USAErik D. EmmonsDepartment of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USAM F GharaibehDepartment of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USAR. A. PhaneufDepartment of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USAA. L. D. KilcoyneDepartment of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USAA. S. SchlachterDepartment of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USAS. SchippersDepartment of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USAA. MüllerDepartment of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USAHimadri ChakrabortyDepartment of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USAMohamed El‐Amine MadjetDepartment of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USAJan M. RostDepartment of Physics, MS 220, University of Nevada, Reno, Nevada 89557-0058, USA
2005lv
ABI
Аннотация
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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