Separating Dipole and Quadrupole Contributions to Single-Photon Double Ionization
S. Grundmann, F. Trinter, A. W. Bray, S. Eckart, J. Rist, G. Kastirke,, D. Metz, S. Klumpp, J. Viefhaus, L. Ph. H. Schmidt, J. B. Williams, R., D\"orner, T. Jahnke, M. S. Sch\"offler, A. S. Kheifets
TL;DR
This paper presents a detailed experimental and theoretical study that separates dipole and quadrupole contributions in helium's single-photon double ionization, revealing new insights into the quasifree mechanism.
Contribution
It introduces a method to distinguish dipole and quadrupole effects in photo-double-ionization using kinematically complete measurements and ab initio theory.
Findings
Successful separation of dipole and quadrupole contributions
Observation of pure quadrupole transition emission patterns
Enhanced understanding of the quasifree ionization mechanism
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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