Photoionization of atoms encapsulated in endohedral ions A@ C60 ±z

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Results of a theoretical study of photoionization cross sections and photoelectron angular asymmetry parameters of atoms confined by positively C60 +z or negatively C60 -z charged fullerene shells are presented. For negatively charged C60, entirely new confinement resonances, termed Coulomb confinement resonances, that dominate the spectra of the encapsulated atoms are predicted. In addition, the effect of a negative C60 shell is to move some of the oscillator strength of the encapsulated atom from the discrete excitation region into the continuum. For positively charged C60, the situation is much different; no Coulomb confinement resonances occur in the photoionization spectrum of the encapsulated atom, and charging the shell positively does nothing to the photoionization cross section (as a function of photon energy) except to increase the threshold energy. The findings result from model Hartree-Fock calculations of 1s photoionization of Ne confined by neutral, negative, and positive C60. © 2006 The American Physical Society.

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Physical Review A - Atomic, Molecular, and Optical Physics

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