Abstract
Numerous perturbation-allowed transitions in the 6-μm ν4 NH3 band are assigned by laser-Stark spectroscopy. The transitions are forbidden in the sense that they follow the rules ΔK = ±2, a ↔ s, in contrast to the allowed transitions in ν4, which follow the rules ΔK = ±1, a ↔ a, s ↔ s. These lines indicate the presence of a significant perturbation, which should be included in the analysis of ν4 and which, through combination relations with allowed transitions, will provide a basis for precisely determining K-dependent energy intervals in NH3.
© 1983 Optical Society of America
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