Fig. 1

a) Fourier-transform, far infrared spectrum recorded at the SOLEIL synchrotron: 120 scans accumulated (~7 h) at the highest resolution (0.001 cm-1). b) Calculated spectra (at 300 K) of 15NH (red) and 15NH2 (green) radicals. Inset shows the fine-structure components of the N = 4 ← 3 transition of 15NH and the doublet structure of the NKaKc = 330 ← 221b-type rotational transition of 15NH2.
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