Listening to electrons talk

A Max Planck Institute team measured the g-factor of the outermost electron in lithium-like tin ions with unprecedented precision, achieving 0.5 parts per billion experimental accuracy and 6 parts per billion theoretical precision. This work tests quantum electrodynamics (QED) in strong electric fields, advancing our understanding of fundamental physics. Results agree within uncertainties, validating QED theory. Future research on heavier ions and improved calculations may provide more stringent tests of QED in extreme conditions.