Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical Transitions at the Neutral and Charged Vacancies in Diamond   We used the exact eigenvectors of the generalized Hubbard Hamiltonian
solution to predict the transition intensities of the well known $GR1$ and
$ND1$ transitions at the neutral and charged vacancies in diamond. In addition
to using exact eigenvectors, the method of the calculation is more precise than
already reported calculations. The quantitative results can exlain recent
experimental data very good.

37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th