Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ExoMol molecular line lists -- XLIII: Rovibronic molecular line list the
  low-lying two states of NaO   The sodium monoxide radical (NaO) is observed in night glow in the Earth's
mesosphere and likely has astronomical importance. This study concerns the
optical transitions within the ground X $^2\Pi$ state and to the very low-lying
($T_{\textrm e}\approx 2000$ cm$^{-1}$) excited A $^2\Sigma^+$ state. A line
list consisting of rovibronic term values, allowed electric dipole transitions,
Einstein coefficients, and partition functions for varying temperature are
produced due to a variational solution of the coupled-channel Schr\"{o}dinger
equations using the program \Duo. MRCI \textit{ab initio} calculations
characterising the potential energy curves of the both states, spin-orbit and
$L$-uncoupling non-adiabatic matrix elements, as well as permanent and
transition dipole moments were integral in formation of the final
deperturbation model. \textit{Ab initio} potential energy curves are
represented in the analytical Extended-Morse-Oscillator form and refined, along
with the spin-orbit and $L$-uncoupling functions, by least-squares fitting to
the available spectroscopic data. The input experimental data consisted of pure
rotational transitions within the fine structure components of the X $^2\Pi$
state for $v''\in [0,3]$ vibrational levels as well as the rovibronic A
$^2\Sigma^+(v'=0) \leftarrow$ X $^2\Pi(v''=0)$ transitions, both with limited
coverage over rotational excitation. The lack of data detailing the vibrational
structure of the X and A states prompts a request for further experimental
study of higher excited levels which would provide a robust spectroscopic
model. The NaO NaOUCMe line list is available via www.exomol.com and the CDS
database.

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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin