Measurement of the ratio h/mRb and determination of the fine structure constant

We present a review of the most precise determinations of the fine structure constant a which are obtained in different domains of physics. We describe the measurement of the ratio h/m(Rb) between the Planck constant and the mass of Rubidium atom which leads to a precise value of alpha which is very few dependent of the QED. Finally, we present a review of the different determinations of the von Kitzling constant R-K. (C) 2011 Academic des sciences. Published by Elsevier Masson SAS. All rights reserved.