Giant resonances of endohedral atoms

Abstract

We demonstrate for the first time that the effect of fullerene shell upon photoionization of the "caged" atom in an endohedral can result in formation of Giant Endohedral Resonances or GER. This is illustrated by the concrete case of Xe@C60 photoionization cross-section that exhibits at 17 eV a powerful resonance with total oscillator strengths of about 25. The prominent modification of the 5p6 electron photoionization cross-section of Xe@C60 takes place due to strong fullerene shell polarization under the action of the incoming electromagnetic wave and oscillation of this cross-section due to the reflection of the photoelectron from Xe by the C60. These two factors transform the smoothly decreasing 5p6 cross-section of Xe into a rather complex curve with a powerful maximum for Xe@C60, with the oscillator strength being equal to 25! We present also the results for the dipole angular anisotropy parameter that is strongly affected by the reflection of the photoelectron waves but not modified by C60 polarization. The polarization of C60 is expressed via its total photoabsorption cross-section. The reflection of the photoelectron is taken into account in the frame of the so-called bubble potential that is a spherical delta-type potential.

arXiv comment7pages, 3 figures, 14 references,some previous references are removed

References in corpus (2)

• On the possibility to consider fullerene shell C60 as a conducting sphere
• On the vacancy decay in endohedral atoms

Cited by in corpus (7)

• Diffuse versus square-well confining potentials in modelling $A$@C${}_{60}$ atoms
• Confinement and correlation effects in the Xe@C60 generalized oscillator strengths
• Photoionization of atoms stuffed inside a two-shell fullerene
• Fullerenes and endohedrals as "big atoms"
• Slow long-range decay of bound Hartree-Fock orbitals and enhancement of the exchange interaction and tunneling
• Photoabsorption spectrum of the Xe@C${}_{60}$ endohedral fullerene
• Confinement and electron correlation effects in photoionization of atoms in endohedral anions: Ne@C60^{z-}