b 1Σ+ and a 1Δ emissions from group VI—VI diatomic molecules: b0+ → X10+, X21 emissions of TeSe

Abstract Near-infrared emissions of the b0 + → X 1 0 + , X 2 1 band systems of TeSe have been observed in a discharge flow system. Analysis of the spectra yielded T e values of the X 2 1 and b0 + states of 1235 ± 5 cm −1 and 8794 ± 5 cm −1 , respectively, and a vibrational spacing in the b0 + state of ω e (b) = 294 ± 3 cm −1 .