Optical zeeman spectroscopy of the (0, 0) bands of the B 3Π-X3 Δ and A 3Φ-X 3Δ transitions of titanium monoxide, TiO

Wilton L. Virgo, Timothy Steimle, John M. Brown

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The Zeeman effect on lines in the (0,0) band of the B 3Π-X3 Δ (γ′) system and in the (0,0) band of the A 3Φ-X3 Δ (γ) system of titanium monoxide, TiO, have been recorded and analyzed. Magnetic tuning of the low rotational spectral features recorded at high resolution (FWHM ≃ 35 MHz) and at field strengths of up to 1.2 kG is accurately modeled using an effective Zeeman Hamiltonian. A comparison is made with previous predictions, which were based on field-free spectroscopic parameters. It is shown that the large Λ-doubling in the B 3Π state necessitates the inclusion of ΔJ = ±1 matrix elements in the representation of the effective Hamiltonian operator. The observed spectra could only be modeled by allowing the electronic spin and orbital magnetic g-factors, gs and gL, of the B 3Π and A 3Φ states to deviate from 2.002 and 1.000. Nonadiabatic mixing with the nearby C 3Δ state is proposed as the cause of these deviations.

Original languageEnglish (US)
Pages (from-to)567-573
Number of pages7
JournalAstrophysical Journal
Issue number1 I
StatePublished - Jul 20 2005


  • Astrochemistry
  • Molecular data
  • Molecular processes
  • Stars: late-type
  • Stars: magnetic fields

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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