Abstract
DURING an attempt to improve measurements on the Vegard-Kaplan bands of N2 using a silent (ozonizer type) discharge through nitrogen as source, as recommended by Wulf and Melvin1, three new bands in the blue region of the spectrum were observed. These bands were afterwards obtained quite readily in an ordinary induction-coil discharge through nitrogen at relatively very high pressure (around 10 cm. mercury). The bands were obtained with commercial nitrogen, with special oxygen-free nitrogen, and with atmospheric nitrogen made by bubbling air through alkaline pyrogallol. The bands do not appear at lower pressure or in discharges through air. The bands disappear if a little oxygen is mixed with the nitrogen, and hydrogen and water vapour also have an inhibiting action. In all the spectra taken, the NOγ and OH bands were weakly present, but all the experimental evidence seems to favour the assignment of the bands to N2.
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