Enhanced nondipole effects in photoelectron angular distributions near giant dipole autoionizing resonances in atoms

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It is found that dipole-quadrupole photoelectron angular distribution parameters in regions of [Formula Presented] giant dipole resonances in [Formula Presented] and [Formula Presented] transition-metal atoms are resonantly increased to such an extent that they can dominate the effects of dipole transitions on the asymmetry of the photoelectron angular distribution. This is illustrated for [Formula Presented] photoionization of Cr and Mn, as well as for [Formula Presented] photoionization of Mo and Tc, where the “spin-polarized” random-phase approximation with exchange calculations are performed with allowance for correlations in both dipole and quadrupole channels. © 2003 The American Physical Society.

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Physical Review A - Atomic, Molecular, and Optical Physics

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