Inner-shell near-threshold photoionization of A @ C60 endohedral atoms

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Calculations were performed to provide insight into both differential and total photoionization cross sections of endohedral atoms with particular emphasis on confinement and molecular resonances in these cross-sections. Low-energy inner-shell photoelectron angular distribution spectra for at-the-center endohedral atoms were found to be identical in shape to those for free atoms, but as the photoelectron energy increases, the similarity disappears. In addition, for low-energy spectra, this similarity was explained physically and, thus, a justification for the use of empirically adjusted spherical model potentials to represent the role of the confinement in photoionization of endohedral atoms was presented.

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Physical Review A - Atomic, Molecular, and Optical Physics

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