Abstract
A new weak emission band system of the SeO molecule consisting of 34 band heads degraded to shorter wavelengths has been observed for the first time in the spectral region 6730–8570 Å. The vibrational analysis of the system suggests that it arises from the transition A3Πreg-X0+, 1. All the five subsystems allowed by the selection rule ΔΩ = 0, ±1 have been identified. The constants in cm−1 derived for the A3Π state are (Here the Te values are expressed with respect to the minimum in the Ω = 0+ component of the ground electronic state X. The Te value of the A33Π2 component is estimated by using the vibrational constants of the components A1 and A2 since ΔG(12) is practically the same for all three components.) An approximate value of the rotational constant B0 of state A estimated from the separations of the observed P and Q heads and the known rotational constant of state X is = 0.470 cm−1 (for 3Π0).
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