Determination of the fine structure constant with atom interferometry and Bloch oscillations

Details Determination of the fine structure constant with atom interferometry and Bloch oscillations Determination of the fine structure constant with atom interferometry and Bloch oscillations

2008-12-16

arxiv.org/abs/0812.3139v1

Physics

Atomic Physics

Scientific paper

We use Bloch oscillations to transfer coherently many photon momenta to atoms. Then we can measure accurately the recoil velocity $\hbar k/m$ and deduce the fine structure constant $\alpha$. The velocity variation due to Bloch oscillations is measured using atom interferometry. This method yields to a value of the fine structure constant $\alpha^{-1}= 137.035 999 45 (62)$ with a relative uncertainty of about $4.5 \times 10^{-9}$.

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