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THE 0–0 AND 1–0 BANDS OF THE <i>A</i>(<sup>3</sup>Π<sub><i>i</i></sub>)–<i>X</i>(<sup>3</sup>Σ<sup>−</sup>) SYSTEM OF NH
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1959
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EngineeringNh MoleculesChemistryElectronic Excited StateSpectroscopic PropertyQuantum MaterialsPhotophysical PropertyMolecular SpectroscopyPhysicsPhotochemistryAtomic PhysicsPhysical ChemistrySystem Of NhQuantum ChemistryCrystallographyIntensity DistributionExcited State PropertyNatural SciencesSpectroscopyApplied PhysicsCondensed Matter PhysicsX Electronic States
NH molecules have been produced during the flash photolysis of HNCO, and the 0–0 and 1–0 bands of the A( 3 Π i ) ← X( 3 Σ − ) system have been photographed in absorption in the third order of a 21-foot concave grating spectrograph. The intensity distribution in the bands showed that the molecules were approximately at room temperature. The lines of lowest J value are identified for 25 branches of the 0–0 band and 19 branches of the 1–0 band. The analysis of the 0–0 band leads to a correction of the published line assignments for this band. The spin splittings in both the A and X electronic states, and the A-doubling in the A state, are considered in detail. Wavelengths in air are given for lines of astrophysical interest.