Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precise determination of h/m_Rb using Bloch oscillations and atomic
  interferometry: a mean to deduce the fine structure constant   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.

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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: solv-int
2
The categories of this paper are: math
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas