Plans for laser spectroscopy of trapped cold hydrogen-like HCI
  Laser spectroscopy studies are being prepared to measure the 1s ground state hyperfine splitting in trapped cold highly charged ions. The purpose of such experiments is to test quantum electrodynamics in the strong electric field regime. These experiments form part of the HITRAP project at GSI. A brief review of the planned experiments is presented. 
D.F.A. Winters, A.M. Abdulla, J.R. Castrejon Pita, A. de Lange, D.M.   Segal, R.C. Thompson