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

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