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Microwave spectroscopy of MgO in the a3Π and X1Σ states

Authors
Journal
Journal of Molecular Structure
0022-2860
Publisher
Elsevier
Publication Date
Volume
795
Identifiers
DOI: 10.1016/j.molstruc.2006.02.026
Keywords
  • Microwave Spectroscopy
  • Magnesium Oxide
  • Rotational Spectrum
  • Perturbation
  • Excited Electronic State

Abstract

Abstract Pure rotational transitions of MgO in the a 3Π i state and the ground X 1Σ + state (v=1–3) were observed in the 210–400 GHz region. The MgO molecule was produced by a DC discharge in a mixture of Mg vapor and N 2O. A simultaneous deperturbation analysis for the X 1Σ +, a 3Π, and A 1Π states was carried out for the observed transition frequencies including previous high-resolution data, where the energy levels were calculated by diagonalizing the energy matrix including the spin–orbit and orbit–rotation interactions among three electronic states with vibrational levels up to v=9. A centrifugal term of the spin–orbit interaction between the a 3Π i and X 1Σ + states was newly introduced to improve quality of the fitting, to explain the observed Λ-type doubling of the a 3Π i state.

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