Experimental evidence for as the predissociating state in the B3Πg and a1Πg states of N2

Abstract

Predissociation in the B3Πg, ν = 12 level of N2 is reexamined from a study of the 12–8 band of the [Formula: see text] transition in absorption as well as in emission under different conditions. New intensity perturbations are discovered at N′ = 27 and 28 for the R22 and R33 branches respectively and at about N′ = 29 for the Q11, Q22, and Q33 branches. These intensity perturbations, as well as the one already known at about N = 33, are suppressed in emission by increasing the pressure of N2. A new break-off point at N′ ≥ 42 is observed at high pressure. The analysis of these results confirms the existence of a [Formula: see text] state with a shallow potential well. The experimental molecular parameters of the [Formula: see text]state are in good agreement with the theoretical values.