Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Many body quantum physics in XANES of highly correlated materials, mixed
  valence oxides and high temperature superconductors   The x-ray absorption near edge structure (XANES), developed in these last 40
years using synchrotron radiation, is a unique tool probing electronic
correlations in complex systems via quantum many body final state effects.
Multi electron excitations have been observed first in the sixties in x-ray
absorption spectra of atoms and later in molecules and solids. The applications
of XANES many body final states to probe unique features of electronic
correlation in heavy fermions, mixed valence systems, mixed valence oxides and
high temperature superconductors are discussed.

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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
18
The categories of this paper are: econ
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom