Lne-Syrte Clock Ensemble:. New 87Rb Hyperfine Frequency Measurement - Spectroscopy of 199Hg and 201Hg Optical Clock Transition
Abstract
This article describes recent frequency measurements performed with the LNE-SYRTE atomic clock ensemble. First, we report a new determination of the rubidium 87 hyperfine frequency, performed using Rb and Cs atomic fountains. The measurement has a statistical uncertainty below 10-16 and an overall uncertainty of 1.1 parts in 1015. Second, we report the first laser spectroscopy of the 1S0-3P0 optical clock transition at 265.6 nm in laser-cooled fermionic isotopes of neutral mercury. The absolute frequency is measured with a fractional uncertainty of ~ 5 parts in 1012 which improves upon previous indirect determinations by more than 4 orders of magnitude, an important step toward the realization of an optical lattice clock.
- Publication:
-
Frequency Standards and Metrology
- Pub Date:
- April 2009
- DOI:
- 10.1142/9789812838223_0008
- Bibcode:
- 2009fsm..conf...82P
- Keywords:
-
- Atomic clocks;
- Time and Frequency;
- Laser cooling of atoms