Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excited states of beryllium atom from explicitly correlated wave
  functions   A study of the first excited states of beryllium atom starting from
explicitly correlated wave functions is carried out. Several properties are
obtained and discussed focusing on the analysis of the Hund's rules in terms of
the single--particle and electron pair intracule and extracule densities. A
systematic study of the differences on the electronic distributions of the
singlet and triplet states is carried out. The trial wave function used to
describe the different bound states consists of a generalized Jastrow-type
correlation factor times a configuration interaction model wave function. This
model wave function has been fixed by using a generalization of the optimized
effective potential method to deal with multiconfiguration wave functions. The
optimization of the wave function and the calculation of the different
quantities is carried out by means of the Variational Monte Carlo method.

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The categories of this paper are: funct-an
16
The categories of this paper are: stat
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The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci