Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precise measurement of hyperfine structure in the $ \rm {3\,S_{1/2}} $
  state of $ \rm{^7Li} $   We report a precise measurement of hyperfine structure in the $ \rm
{3\,S_{1/2}} $ state of the odd isotope of Li, namely $ \rm {^7Li} $. The state
is excited from the ground $ \rm {2\,S_{1/2}} $ state (which has the same
parity) using two single-photon transitions via the intermediate $ \rm
{2\,P_{3/2}} $ state. The value of the hyperfine constant we measure is $ A =
93.095(52)$ MHz, which resolves two discrepant values reported in the
literature measured using other techniques. Our value is also consistent with
theoretical calculations.

33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol