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The ν<sub>5</sub> Fundamental Bands of N<sub>2</sub>H<sub>2</sub> and N<sub>2</sub>D<sub>2</sub>
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1974
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EngineeringPhysicsInfrared Absorption SpectrumSpectroscopyNatural SciencesCondensed Matter PhysicsInfrared SpectroscopyAtomic PhysicsAbsorption SpectroscopyPhysical ChemistryN 2Quantum ChemistryChemistrySymmetric Ground StateSpectroscopic PropertySpectra-structure Correlation
The infrared absorption spectrum of diimide (N 2 H 2 ) in the 3.2 μm region has been reexamined at higher resolution than previously, and that of dideuterodiimide (N 2 D 2 ) at 4.3 μm has been recorded for the first time. The ν 5 fundamental (A- and B-type hybrid band) for both isotopic molecules has been analyzed, and a complete set of rotational and centrifugal distortion constants for the ground and ν 5 = 1 states have been determined. The rotational constants of the ground states are (cm −1 ) [Formula: see text] and the following geometrical parameters were obtained for the planar trans-conformation of diimide : [Formula: see text] From the intensity alternation observed in the J structure of N 2 H 2 spectrum, it is concluded that diimide has a totally symmetric ground state.