An absorption band in gaseous ammonia at 3 μ is observed at high resolution and attributed to the doubly degenerate fundamental ν 3 . The constants ν 0 = 3442.9, A 0 = A 1 = 6.13, A 1 ζ = 0.29, and B 1 = 9.75 cm. −1 describe the band. Many of the observed lines are doublets. This doubling is a result of the inversion of the ammonia molecule and the value 1.1 cm. −1 is calculated for the inversion doubling of the 0010 state.
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C. Cumming (1955) studied this question.
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