Twenty-one transitions of the v2 = 2 a ← v2 = 1 s hot band of 14NH3 have been observed by an infrared microwave sideband laser spectrometer with an absolute accuracy of 0.00002 cm-1. One hundred and seventeen transitions of the band have been obtained by a Fourier transform infrared spectrometer at a resolution of 0.005 cm-1. A weighted least-squares analysis of these data has been carried out to yield 17 molecular parameters for the v2 = 2 a state. These parameters reproduce the experimental frequencies with a root mean square deviation of 0.000123 cm-1. To calculate the frequencies to this accuracy it was necessary to take into account the Δ(K - l) = ±3 interaction between the v2 = 2 a and v4 = 1 a states.
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