LKB - Trapped Ions Metrology

Trapped Ions Group

The group’s activity is centered on precision measurements with cold trapped ions. In particular, the simplest of all molecules, the H2+ ion, is studied both experimentally and theoretically. The general aim of this research is to test fundamental theories and improve our knowledge of fundamental physical constants.


Recent Papers

Proton-electron mass ratio from laser spectroscopy of HD+ at the part-per-trillion level

S. Patra, M. Germann, J.-Ph. Karr, M. Haidar, L. Hilico, V. I. Korobov, F. M. J. Cozijn, K. S. E. Eikema, W. Ubachs, J. C. J. Koelemeij

Science 369, 1238-41, 2020

Trapping, Cooling, and Photodissociation Analysis of State-Selected H2+ Ions Produced by (3 + 1) Multiphoton Ionization

J. Schmidt , Th. Louvradoux , J. Heinrich, N. Sillitoe, M. Simpson, J.-Ph. Karr, L. Hilico

Phys. Rev. Appl. 14, 024053, 2020

The proton size

J.-Ph. Karr, D. Marchand, E. Voutier

Nature Rev. Phys. 2, 601-614, 2020


Filter Categories
PhD Student
  • Albane Douillet
    Associate Professor
  • Jean-Philippe Karr
    Associate Professor
  • Laurent Hilico
  • Group
    Trapped Ions Group
  • Abdessamad Mbardi
  • Hugo Nogueira

We are always looking for brillant motivated scientists to join our group.

Check the open positions or send us your CV for application.




Laboratoire Kastler Brossel, 4 place Jussieu, Case 74, 75252 Paris Cedex 05