Separating Dipole and Quadrupole Contributions to Single-Photon Double Ionization

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Authors

Grundmann, S.
Trinter, F.
Bray, A. W.
Eckart, S.
Rist, J.
Kastirke, Gregor
Metz, D.
Klumpp, S.
Viefhaus, J.
Schmidt, L. Ph H.

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2018

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Article

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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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Grundmann, S., Trinter, F., Bray, A. W., Eckart, S., Rist, J., Kastirke, G., … Kheifets, A. S. (2018). Separating Dipole and Quadrupole Contributions to Single-Photon Double Ionization. Physical Review Letters, 121(17). doi:10.1103/physrevlett.121.173003

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0031-9007

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