Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the ratio between g-factors of the ground states of
  $^{87}$Rb and $^{85}$Rb   The ratio between the Land\'e g-factors of the $^{87}$Rb $F=2$ and $^{85}$Rb
$F=3$ ground state hyperfine levels is experimentally measured to be
$g_F(87)/g_F(85) = 1.4988586(1)$, consistent with previous measurements. The
g-factor ratio is determined by comparing the Larmor frequencies of overlapping
ensembles of $^{87}$Rb and $^{85}$Rb atoms contained within an evacuated,
antirelaxation-coated vapor cell. The atomic spins are polarized via
synchronous optical pumping and the Larmor frequencies are measured by
off-resonant probing using optical rotation of linearly polarized light. The
accuracy of this measurement of $g_F(87)/g_F(85)$ exceeds that of previous
measurements by a factor of $\approx 50$ and is sensitive to effects related to
quantum electrodynamics.

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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ph