Laser magnetic resonance spectroscopy of SO in the X 3Σ− state with a CO2 laser as a source

Abstract

Vibration–rotation transitions of SO in the X 3Σ− state have been observed in the 1100 cm−1 region by laser magnetic resonance spectroscopy with a C 18O2 laser as a source. Transitions of the fundamental band observed for the normal species 32S16O were mainly of the ΔN=−1, ΔJ=0 type, and in addition magnetic-field-induced transitions with either ΔN=−1, ΔJ=3 or ΔN=−1, ΔJ=+1 and transitions with ΔN=−3 were also observed. A few weakly tunable ΔN=ΔJ=−1 transitions were observed for the v=1←0 and 2←1 bands of 32S 16O and for the v=1←0 band of 34S 16O. For 32S 18O the band origin is low enough to observe nine low-N transitions. Observed resonances were analyzed to determine rotational, spin–spin and spin–rotation coupling constants for the v=1 state, and g factors for the v=0, 1, and 2 states of 32S 16O. The band origins are 1138.0089 (4) and 1125.3085 (28) cm−1 for v=1←0 and 2←1, respectively. For 34S 16O and 32S 18O the origins of the fundamental bands were respectively determined to be 1126.9295 (30) and 1095.4265 (8) cm−1. All values in parentheses denote three standared errors. Rotational, spin–spin and spin–rotation interaction constants, and g-factors were also obtained for the v=1 state of 32S 18O. By using the four values of the band origins the harmonic frequency and the anharmonicity constant were calculated for 32 S16O: ωe =1150.710 (11) cm−1 and ωexe=6.3505 (51) cm−1.