Abstract
Lines in the ν 3 (antisymmetric stretch) fundamental band of the N 3 radical in the X̃ 2Π g state have been detected by CO laser magnetic resonance. The observations have been assigned to P, Q, and R lines in the fundamental vibration-rotation band and lead to a precise determination of the vibrational interval, the ground-state rotational constant and its dependence on the antisymmetric stretching vibration: ν 3 = 1644.67903(24) cm −1, B 0=0.431438(16) cm −1 and α 3=0.004357(18) cm −1.
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