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Possible reasons that confinement resonances are not observed in a recentphotoionization experiment on the endohedral fullerene Ce@C82+ are explored.The effect of the polarization of the fullerene shell in response to theionization of the endohedrally encaged atom A@Cn, termed the "shielding"effect, has been investigated and found to be relatively small; no more than a20% effect near threshold, and much less at higher energies. It is argued thatmost likely, the absence of confinement resonances in Ce@C82+ is due primarilyto the finite thickness of the carbon cage; the off-the-center position andthermal vibration of the encaged atom, discussed elsewhere, further weaken theresonances rendering them beyond the sensitivity of the experiment to detect,in this case. For other situations/endohedrals, the confinement resonancesshould well be observable, and Ne@C60 is suggested as an excellent candidate.

On confinement resonances in A@C60 photoionization: easy to observe?