Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultralong Rydberg Cs$_2$ Molecules Investigated by Combined ab initio
  Calculations and Perturbation Theory   Vibrational properties of ultralong Rydberg Cs$_2$ molecules are investigated
on corresponding potential curves obtained by perturbation theory. The Rydberg
Cs$_2$ molecules are associated by a Rydberg Cs($nS/nP$) atom $(n=30-70)$ and a
ground state Cs($6s$) atom. The starting point for the perturbation treatment
of corresponding Rydberg molecular potential curves is to generate accurate
atomic Rydberg states from realistic {\it ab initio} effective core potential.
The calculated results have similar characteristics with available experimental
and theoretical investigations on Rydberg Rb$_2$ molecules. And this is the
first time that Rydberg molecules are studied at the {\it ab initio} level.

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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat