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, as, in contrast to the allowed transitions in ν4, which follow the rules ΔK = ±1, aa, ss. 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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