Abstract
The rotational spectrum of the ND2 radical in the X̃2B1 ground state was observed in the 265– 531 GHz region by using a frequency modulation spectrometer. The ND2 radical was generated in a free space cell by a dc glow discharge in ND3, or in a mixture of N2 and D2. One hundred twenty fine and hyperfine components of 7 rotational transitions were observed, and were analyzed by least-squares methods; this yielded the rotational and centrifugal distortion constants, as well as the spin–rotation and hyperfine coupling constants for both the nitrogen and deuterium nuclei. The nitrogen nuclear spin–rotation constant Caa(N) has the anomalously large value of 0.269±0.027(3σ) MHz in this analysis, but such a value is necessary to achieve the standard deviation of the fit comparable to the experimental errors. The value is mainly caused by the relatively low-lying Ã2A1 electronic state.
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