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Separating Dipole and Quadrupole Contributions to Single-Photon Double Ionization

Grundmann, S; Trinter, F; Bray, Alexander; Eckart, Sebastian; Rist, Jonas; Kastirke, G; Metz, Daniel; Klumpp, S; Viefhaus, J; Schmidt, Lothar Ph H; Williams, J B; Kheifets, Anatoli


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...[Show more]

CollectionsANU Research Publications
Date published: 2018-10-23
Type: Journal article
Source: Physical Review Letters
DOI: 10.1103/PhysRevLett.121.173003
Access Rights: Open Access


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