Enhanced nondipole effects in photoelectron angular distributions near giant dipole autoionizing resonances in atoms
V. K. DolmatovDepartment of Physics and Earth Science, University of North Alabama, Florence, Alabama 35632, USAA. S. BaltenkovArifov Institute of Electronics, Akademgorodok, Tashkent 700125, UzbekistanSteven T. MansonDepartment of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA
ABI
Abstract
It is found that dipole-quadrupole photoelectron angular distribution parameters in regions of $n\stackrel{\ensuremath{\rightarrow}}{p}\mathrm{nd}$ giant dipole resonances in $3d(n=3)$ and $4d(n=4)$ 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 $3d$ photoionization of Cr and Mn, as well as for $4d$ 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.
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