Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-Statistic Selection Rules for Multiphoton Transitions: Application
  to Helium Atom   A theoretical investigation of the three-photon transition rates $
2^1P_1\rightarrow 2^1S_0\;,1^1S_0 $ and $ 2^3P_2\rightarrow 2^1S_0\;,1^1S_0 $
for the helium atom is presented. Photon energy distributions and precise
values of the nonrelativistic transition rates are obtained with employment of
correlated wave functions of the Hylleraas type. The possible experiments for
the tests of the Bose-Einstein statistics for multiphoton systems are
discussed.

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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an