The electric dipole moment of an electron in H-like ions in an   electrostatic storage ring
  Theoretical studies are presented how the electric dipole moment (EDM) of the electron in H-like ions in electrostatic storage rings can sensitively be determined. With the proposed experiments a new constraint of about $10^{-29}$ e cm for the electron EDM can be established what is by an order of magnitude more restrictive than the existing bounds. Experiments with H-like ions may provide a possibility to distinguish between the electron EDM effect and the effect of P,T violating interaction between the atomic electron and the nucleus. 
A. A. Bondarevskaya, D. V. Chubukov, O. Yu. Andreev, E. A. Mistonova,   L. N. Labzowsky, G. Plunien, D. Liesen and F. Bosch
physics.atom-ph