OPTICAL ZEEMAN SPECTROSCOPY OF THE (0, 0) BANDS OF THE B ~3Π-X~3Δ AND A ~3Φ-X ~3Δ TRANSITIONS OF TITANIUM MONOXIDE, TiO

摘要

The Zeeman effect on lines in the (0,0) band of the B ~3Π-X~3Δ (γ′) system and in the (0,0) band of the A ~3Φ-X~3Δ (γ) system of titanium monoxide, TiO, have been recorded and analyzed. Magnetic tuning of the low rotational spectral features recorded at high resolution (FWHM approx= 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.