The d¹∑⁺-c¹Π system of NH

Abstract

The singlet systems of NH have been excited in a mildly condensed transformer discharge through flowing ammonia gas. The 0-0 bands, 2530Å of d¹∑⁺-c¹Π and 3240Å of c¹Π-a¹Δ systems, appear with considerable intensity compared to the 4502Å band of the c¹Π-b¹∑⁺ system. Besides the 2530Å bands, two weaker bands at 2683Å and 2516Å are also excited. They are photographed in the second order of a Jarrell Ash 3.4 m. grating spectrograph at a dispersion of 2.6Å/mm. Rotational analysis of the two weaker bands show that they belong to the d¹∑⁺-c¹Π system and further supports their assignment as the 0–1 and 1-1 bands.