Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ionic Kratzer bond theory and vibrational levels for achiral covalent
  bond HH   A dihydrogen Hamiltonian reduces to the Sommerfeld-Kratzer-potential, adapted
for field quantization according to old-quantum theory. Constants omega_e, k_e
and r_e needed for the H_2 vibrational system derive solely from hydrogen mass
m_H. For H_2, a first principles ionic Kratzer oscillator returns the covalent
bond energy within 0,08 % and all levels within 0,02 %, 30 times better than
the Dunham oscillator and as accurate as early ab initio QM.

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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
2
The categories of this paper are: math
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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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: atom-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: solv-int