Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic effects in the electronic structure for the 3d paramagnetic
  ions   It has been shown that relativistic spin-orbit effects have enormous
influence on the electronic structure of the correlated electron systems 3dn.
The s-o coupling produces the fine electronic structure with a large number of
low- energy, < 10 meV, localized states, These states affect enormously
electronic and magnetic properties of 3d-ion compounds at low- and
room-temperature regions. It is inferred that the relativistic s-o effects and
the multiplet structure on individual atoms are indispensable for the proper
evaluation of the electronic structure of paramagnetic 3d ions.

16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
19
The categories of this paper are: eess