Highly charged ions, quantum-electrodynamics, and the electron mass

High precision experiments on the magnetic moment of hydrogen-like ions confined in a Penning trap have provided the most stringent test of bound-state quanturn-electrodynamic calculations. Experiments have been performed on single C5+ and O7+ ions. These experiments are briefly reviewed and prospects for future improvements and extension to other systems are discussed. (C) 2006 Elsevier B.V. All rights reserved.