Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charged Hydrogenic, Helium and Helium-Hydrogenic Molecular Chains in a
  Strong Magnetic Field   A non-relativistic classification of charged molecular hydrogenic, helium and
mixed helium-hydrogenic chains with one or two electrons which can exist in a
strong magnetic field $B \lesssim 10^{16} $G is given. It is shown that for
both $1e-2e$ cases at the strongest studied magnetic fields the longest
hydrogenic chain contains at most five protons indicating to the existence of
the $\rm{H}_5^{4+}$ and $\rm{H}_5^{3+}$ ions, respectively. In the case of the
helium chains the longest chains can exist at the strongest studied magnetic
fields with three and four $\al-$particles for $1e-2e$ cases, respectively. For
mixed helium-hydrogenic chains the number of heavy centers can reach five for
highest magnetic fields studied. In general, for a fixed magnetic field
two-electron chains are more bound than one-electron ones.

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The categories of this paper are: hep-ex
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The categories of this paper are: eess
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom