Absorptive qualities, 16 combination bands

An absolute integrated intensity of 1880(290) cmatm" at STP was determined for the Vi band of N2H using the technique of direct laser absorption spectroscopy in fast ion beams. This value [37] supersedes a previous value determined in the same laboratory [38]. Higher values were predicted by high-quality ab initio calculations, CEPA-1 [36] and Ci-SDQ [39]. Integrated Intensities for the V2 [39] and V3 [36, 39] bands of N2H, for the Vi and V3 bands of N2D [36], and for bands from overtones and combinations of the v, and V3 fundamentals of N2H (N2D ) were also predicted in the ab initio calculations [36, 39]. The V3 band was predicted to be about 140 times weaker than the v, band [36], and the V2 band to be about five times weaker than the band [39]. 

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