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

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, g_s and g_L, 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.