Abstract
We demonstrate that the structure of confinement resonances in the photoionization cross section of an endohedral atom is very sensitive to the mean displacement ⟨a⟩ of the atom from the cage centre. The resonances are strongly suppressed if 2⟨a⟩ exceeds the photoelectron half-wavelength. We explain the results of recent experiments which contradict the earlier theoretical predictions on the existence of confinement resonances in particular endohedral systems.
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