Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong Modification of Radiative Transition Rates due to a
  Breit-Interaction-Induced Avoided Crossing   We present the observations of x-rays emitted from the
$1s2s^{2}2p_{1/2}2p_{3/2}$ inner shell excited state of B-like W and Bi ions.
The relative transition rates are obtained for two dominant radiative
transitions to $1s^{2}2s^{2}2p_{1/2}$ and $1s^{2}2s^{2}2p_{3/2}$. The
experimental results and the comparison with rigorous relativistic calculations
show that the rates of the strong electric dipole allowed $1s^22s^22p$ --
$1s2s^22p^2$ transitions are strongly modified due to a drastic change in the
wavefunction caused by the Breit interaction.

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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: eess
24
The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
2
The categories of this paper are: math