Abstract
The singlet systems of NH have been excited in a mildly condensed transformer discharge through flowing ammonia gas. The 0-0 bands, 2530 A ofd1Σ+−c1Π and 3240 A ofc1Π−a1Δ systems, appear with considerable intensity compared to the 4502 A band of thec1Π −b1Σ+ system. Besides the 2530 A bands, two weaker bands at 2683 A and 2516 A are also excited. They are photographed in the second order of a Jarrell Ash 3·4 m. grating spectrograph at a dispersion of 2·6 A/mm. Rotational analysis of the two weaker bands show that they belong to thed1Σ+−c1Π system and further supports their assignment as the 0–1 and 1-1 bands. The vibrational and rotational constants derived for thed1Σ+ andc1Π states are, Be αe re ΔG½ d1Σ+ state (in cm.−1) 14·3809 0·6119 1·1165 A 2530·30 c1Π state (in cm.−1) 14·7985 1·267 1·1005 A 2122·50 v′-v″ Band Origins in cm.−1 0-0 39511·70 0-1 37389·20 1-1 39919·50
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