Precision measurement on heavy ions contradicts theory of interaction between atomic nucleus and electron

For the first time, a team of researchers under the leadership of TU Darmstadt has succeeded in measuring the transition between energy levels of the lithium-like ions of bismuth with such precision that it has become possible to reassess underlying theories. This has led to a surprising result—the understanding of the interaction between an electron and an atomic nucleus that we have had until now might be erroneous.