The Rotational Structure of the Hydrazoic Acid Bands in the Photographic Infra-Red

Abstract

The third and fourth harmonics of the N–H stretching frequency in hydrazoic acid, at 9547.31 and 12,412.19 cm^—1, respectively, have been studied photographically under high dispersion. The rotational structure has been well resolved and completely analyzed, to yield the rotational constants in the ground and excited states. The effective moments of inertia in the ground state have been combined with other information to determine the structure of the molecule; the best values of the molecular parameters are: $$\begin{array}{cc}{\mathrm{N}}_1–\mathrm{H}\text{=1.012}\mathrm{A}& {\mathrm{N}}_2–{\mathrm{N}}_3\text{=1.128}\mathrm{A}\\ {\mathrm{N}}_1–{\mathrm{N}}_2\text{=1.241}\mathrm{A}& \Delta \mathrm{H}{\mathrm{N}}_1{\mathrm{N}}_2{\text{=110}}^{\circ }{52}^{\prime }.\end{array}$$