Physics – Atomic Physics
Scientific paper
2008-10-17
Phys.Rev.Lett.101:230801,2008
Physics
Atomic Physics
Scientific paper
10.1103/PhysRevLett.101.230801
We report a new experimental scheme which combines atom interferometry with Bloch oscillations to provide a new measurement of the ratio $h/m_{\mathrm{Rb}}$. By using Bloch oscillations, we impart to the atoms up to 1600 recoil momenta and thus we improve the accuracy on the recoil velocity measurement. The deduced value of $h/m_{\mathrm{Rb}}$ leads to a new determination of the fine structure constant $\alpha^{-1}=137.035 999 45 (62)$ with a relative uncertainty of $4.6\times 10^{-9}$. The comparison of this result with the value deduced from the measurement of the electron anomaly provides the most stringent test of QED.
Biraben François
Cadoret Malo
Cladé Pierre
Guellati-Khélifa Saïda
Julien Lucile
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