LASER MAGNETIC-RESONANCE SPECTROSCOPY OF SO IN THE X3SIGMA- STATE WITH A CO2-LASER AS A SOURCE

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 C18O2 laser as a source. Transitions of the fundamental band observed for the normal species 32S16O were mainly of the AN=-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 32S16O and for the v=1→0 band of 34S16O. For 32S18O 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 32S16O. 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 32S18O 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 standard errors. Rotational, spin-spin and spin-rotation interaction constants, and g-factors were also obtained for the v=1 state of 32S18O. By using the four values of the band origins the harmonic frequency and the anharmonicity constant were calculated for 32S16O: ωe= 1150.710 (11) cm-1 and ωexe=6.3505 (51) cm-1. © 1979 American Institute of Physics.