A 3Σ–3Π transition of the SiO molecule

Abstract

The spectrum in the region 4200–4300 Å, attributed to the SiO molecule, has been excited strongly in a r.f. discharge through a mixture of argon and a trace of SiCl4 vapor flowing through a quartz tube. The spectrum consists of a single sequence Δν = 0. The 0–0 and 1–1 bands have been photographed at high dispersion. A rotational analysis of these bands shows that they involve a 3Σ–3II transition and not a 1Σ–3Π transition as reported earlier. The following rotational constants were determined:[Formula: see text]