Controlled strong non-dipole effects in photoionization of confined atoms

It is demonstrated that non-dipole effects in low energy photoionization of atoms surrounded by a repulsive semi-transparent potential can be increase d by many orders of magnitude due to virtual levels occuring in the spectra of photoelectrons as a result of confinement The strengths, widths and pos itions of such resonances in non-dipole channels can be controlled by alter ing the characteristics of the confining potential,and under certain circum stances can be so large that treating quadrupole transitions as a perturbat ion breaks down, even for photon energies as low as tens of eV. Our conclus ions have relevance to the interpretation of non-dipole photoemission spect ra from solids, molecules, atoms trapped inside fullerene molecules, quantu m dots, etc.