Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectrum of coherent backscattering of light by two atoms   We study theoretically inelastic spectrum of coherent backscattering of laser
light by two atoms. For an intense laser field, there are frequency domains of
not only constructive but also destructive (self-)interference of the inelastic
photons. We interpret the emergent spectral features using the dressed states
and considering coherent backscattering as a kind of the pump-probe experiment.

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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn