Visible and near-infrared electronic transitions in NCl and NBr

The reactions of mixtures of halogen atoms (F + (Cl or Br)) with molecular azides produce banded emissions in the visible and near-infrared regions of the spectrum. The observed features correspond to b¹Σ⁺ → X³Σ^? and a¹Δ → X³Σ^? transitions, respectively, in NCl and NBr. The data obtained represent the first spectroscopic observation of the a¹Δ states of these molecules. The molecular constants of the a¹Δ states were determined to have the following values:

	NCl	NBr
$\text{ν}{}_{\mathrm{e}}$	9260 ± 10 cm?1	9226 ± 10 cm?1
$\text{ω}{}_{\mathrm{e}}$	904 ± 6 cm?1	763 ± 4 cm?1
$\text{ω}{}_{\mathrm{e}}\text{x}{}_{\mathrm{e}}$	4.7 ± 1.2 cm?1	2.4 ± 1.6 cm?1
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