The 7.6(5) eV nuclear magnetic-dipole transition in a single Th3+229 ion may provide the foundation for an optical clock of superb accuracy. A virtual clock transition composed of stretched states within the 5F5/2 electronic ground level of both nuclear ground and isomeric manifolds is proposed. It is shown to offer unprecedented systematic shift suppression, allowing for clock performance with a total fractional inaccuracy approaching 1×10-19.
Physical Review Letters
- Pub Date:
- March 2012
- Standards and calibration;
- Determination of fundamental constants;
- Nuclear tests of fundamental interactions and symmetries;
- Physics - Atomic Physics