Gashyphen;phase and N2matrix vibrational spectra of HN3, DN3, H15NNN,15NNNH, D15NNN, and15NNND are reported. The pure rotation spectrum of HN3is given as well. Strong vibrationmdash;rotation interaction is evident in thev5,v6spectra, in the changes of theArotational constant by 4minus;8 in the hydrogen stretching and bending fundamentals, and in the pure rotation spectrum of HN3. Normal coordinates and eight force constants are determined using 22 vibrational frequencies from six molecules. A large (HNN bend)mdash;(HNsngbnd;N stretch) interaction force constant is found. Its magnitude and sign are readily understood in terms of the electronic structure of hydrazoic acid.
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