The Negative Bands of N14 – N15

Abstract

The negative bands of nitrogen were photographed with a mixture which contained about 15 percent of N¹⁵. The 0→0, 1→0 and 0→1 bands of the N¹⁴ – N¹⁵ molecule were analyzed. Their position is within the limits of experimental errors where the elementary theory of the isotopic shifts predicts them. The bands do not show any intensity alternations and there are no perturbations at the places where the corresponding bands of ordinary nitrogen have them.