Laser magnetic resonance spectroscopy of SO in the ? 1Δ state with a CO2 laser as a source

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Abstract
Four vibration–rotation transitions of 32S16O in the 1Δ state were observed by laser magnetic resonance spectroscopy with a C18O2 laser in the 9 μm region as a source. Additional measurements were also made on two transitions of 34S16O. The band origin, the rotational constant, and the g factor in the v=1 state were determined by fixing the molecular constants in the ground vibrational state to those obtained either from microwave spectra or from reanalyzed electron paramagnetic resonance spectra. The second-order effect on the molecular g factor was discussed. The equilibrium bond length was determined to be 1.48886±0.00026 Å. The harmonic frequency and the vibrational anharmonicity constant were calculated from the band origins of the two isotopic species to be ωe=1115.349±0.081 cm−1 and ωexe=6.978±0.041 cm−1, respectively. The errors are all 2.5 times the standard deviations.