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Separating Dipole and Quadrupole Contributions to Single-Photon Double Ionization (1803.10841v2)
Published 28 Mar 2018 in physics.atom-ph
Abstract: We report on a kinematically complete measurement of double ionization of helium by a single 1100 eV circularly polarized photon. By exploiting dipole selection rules in the two-electron continuum state, we observed the angular emission pattern of electrons originating from a pure quadrupole transition. Our fully differential experimental data and companion ab initio nonperturbative theory show the separation of dipole and quadrupole contributions to photo-double-ionization and provide new insight into the nature of the quasifree mechanism.
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