Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long-range Rydberg molecule Rb$_2$: Two-electron \textit{R}-matrix
  calculations at intermediate internuclear distances   The adiabatic potential energy curves of Rb$_2$ in the long-range Rydberg
electronic states are calculated using the two-electron \textit{R}-matrix
method [M. Tarana, R. \v{C}ur\'{i}k, Phys. Rev. A \textbf{93}, 012515 (2016)]
for the intermediate internuclear separations between 35 a.u. and 200 a.u. The
results are compared with the zero-range models to find a region of the
internuclear distances where the Fermi's pseudopotential approach provides
accurate energies. A finite-range potential model of the atomic perturber is
used to calculate the wave functions of the Rydberg electron and their features
specific for the studied range of internuclear distances are identified.

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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th