Millimeter Wave Spectroscopy of Unstable Molecular Species. II. Sulfur Monoxide

Abstract

Several spectral transitions of the gaseous free radical SO have been observed in the millimeter wave region. Analysis of the observed lines confirms that the molecule has a 3Σ ground state and leads to the rotational constants B0=21 523.75 Mc/sec and D0=0.0334 Mc/sec, also to the magnetic coupling constants λ=158 209.4 Mc/sec and γ=—164.52 Mc/sec. The assignments and analysis are confirmed by a close fitting, within approximately 1 Mc/sec, of all measured and calculated frequencies, and by the Zeeman effect which is measured and analyzed for several transitions.