| Autor: |
Cadoret, Malo, De Mirandes, Estefania, Cladé, Pierre, Guellati-Khélifa, Saïda, Schwob, Catherine, Nez, François, Julien, Lucile, Biraben, François |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
The European Physical Journal Special Topics 163 (2008) 101 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1140/epjst/e2008-00813-9 |
| Popis: |
We use Bloch oscillations to transfer coherently many photon momenta to atoms. Then we can measure accurately the ratio h/m_Rb and deduce the fine structure constant alpha. The velocity variation due to the Bloch oscillations is measured thanks to Raman transitions. In a first experiment, two Raman $\pi$ pulses are used to select and measure a very narrow velocity class. This method yields to a value of the fine structure constant alpha^{-1}= 137.035 998 84 (91) with a relative uncertainty of about 6.6 ppb. More recently we use an atomic interferometer consisting in two pairs of pi/2 pulses. We present here the first results obtained with this method. |
| Databáze: |
arXiv |
| Externí odkaz: |
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