Abstract
We have investigated the hyperfine structure of the υ2=1, (J, K)=(1, 1)-→(2, 1)+ mm wave transition and of the ground state (8, 7) inversion transition of 14NH3 in Doppler-limited resolution. Using additional spectroscopic information from different sources it was possible to determine the υ2=1 effective quadrupole coupling constants. Their values are = - (4429 ± 12) kHz and = - (4263 ± 18) kHz.
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