Abstract
Transitions in the ν 2 band of 14NH 3 were recorded by means of an infrared laser microwave two-photon spectrometer. The spectrometer, which uses a minicomputer to step the microwave frequency and record the spectrum, is described. With sample cells outside the laser cavity good lineshapes are obtained, so that the accuracy of frequency measurement was limited by the resettability of the CO 2 or N 2O lasers employed, ∼0.0002 cm −1. The present data are compared to previously obtained results based on CO 2 or N 2O laser frequencies and to recently reported calculations. Rotational constants derived for the hypothetical inversion-free ground and v 2 = 1 states are reported.
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