Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Zeroth order quantum coherences and preparation of pseudopure state in
  homonuclear dipolar coupling spin systems   Dynamics of zeroth order quantum coherences and preparation of the pseudopure
states in homonuclear systems of dipolar coupling spins is closely examined. It
has been shown an extreme important role of the non-diagonal part of zeroth
order coherence in construction of the pseudopure state. Simulations of the
preparation process of pseudopure states with the real molecular structures (a
rectangular (-chloro- -nitrobenzene molecule), a chain (hydroxyapatite
molecule), a ring (benzene molecule), and a double ring (cyclopentane
molecule)) open the way to experimental testing of the obtained results.

30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas