Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Giant modification of atomic transitions probabilities induced by
  magnetic field: forbidden transitions become predominant   Magnetic field-induced giant modification of probabilities for seven
components of 6S1/2 (Fg=3) - 6P3/2 (Fe=5) transition of Cs D2 line forbidden by
selection rules is observed experimentally for the first time. For the case of
excitation with circularly-polarized laser radiation, the probability of
Fg=3,mF=-3 - Fe=5,mF=-2 transition becomes the largest among 25 transitions of
Fg=3 - Fe=2,3,4,5 group in a wide range of magnetic field 200 - 3200 G.
Moreover, the modification is the largest among D2 lines of alkali metals. A
half-wave-thick cell (length along the beam propagation axis L=426 nm) filled
with Cs has been used in order to achieve sub-Doppler resolution which allows
for separating the large number of atomic transitions that appear in the
absorption spectrum when an external magnetic field is applied. For B > 3 kG
the group of seven transitions Fg=3 - Fe=5 is completely resolved and is
located at the high frequency wing of Fg=3 - Fe=2,3,4 transitions. The applied
theoretical model very well describes the experimental curves.

13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn