Abstract
Laser Stark spectroscopy of the R(5, K) transitions in the ν 2 band of ammonia was carried out using coincidences with the 9-μm band CO 2 laser lines. We observed 22 Doppler-free resonances by using an optoacoustic detector and a Lamb-dip stabilized CO 2 laser. A simultaneous analysis of sa, aa, and ss lines yields zero-field transition frequencies with an absolute accuracy of 1 ∼ 2 MHz.
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