State-selective influence of the Breit interaction on the angular distribution of emitted photons following dielectronic recombination

Abstract

We report a measurement of $KLL$ dielectronic recombination in charge states from Kr${}^{+34}$ through Kr${}^{+28}$, in order to investigate the contribution of Breit interaction for a wide range of resonant states. Highly charged Kr ions were produced in an electron beam ion trap, while the electron-ion collision energy was scanned over a range of dielectronic recombination resonances. The subsequent $K\alpha$ x rays were recorded both along and perpendicular to the electron beam axis, which allowed the observation of the influence of Breit interaction on the angular distribution of the x rays. Experimental results are in good agreement with distorted-wave calculations. We demonstrate, both theoretically and experimentally, that there is a strong state-selective influence of the Breit interaction that can be traced back to the angular and radial properties of the wavefunctions in the dielectronic capture.

10 pages, 5 figures

References in corpus (4)

• Relativistic quantum dynamics in strong fields: Photon emission from heavy, few-electron ions
• Polarization measurement of dielectronic recombination transitions in highly charged krypton ions
• Strong higher-order resonant contributions to x-ray line polarization in hot plasmas
• Magnetic Sublevel Population and Alignment for the Excitation of H- and He-like Uranium in Relativistic Collisions

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