Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron recombination, photoionization and scattering via many-electron
  compound resonances   Highly excited eigenstates of atoms and ions with open f shell are chaotic
superpositions of thousands, or even millions of Hartree-Fock determinant
states. The interaction between dielectronic and multielectronic configurations
leads to the broadening of dielectronic recombination resonances and relative
enhancement of photon emission due to opening of thousands of radiative decay
channels. The radiative yield is close to 100% for electron energy . 1 eV and
rapidly decreases for higher energies due to opening of many autoionization
channels. The same mechanism predicts suppression of photoionization and
relative enhancement of the Raman scattering. Results of our calculations of
the recombination rate are in agreement with the experimental data for W20+ and
Au25+.

30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
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
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs