Abstract

Hyperfine structure on the 1 01 → 0 00 and 5 14 → 5 15 rotational transitions in NH 2CHO was measured using a molecular beam maser spectrometer with 8 kHz resolution. The nitrogen quadrupole coupling tensor in the principal inertial axis system was determined. The values are eQq aa = 1960 ± 2 kHz; eQq bb = 1888 ± 3 kHz and eQq cc = −3848 ± 4 kHz. Accurate values for the center frequencies for the rotational transitions were found to be 21 207 432 kHz for the 1 01 → 0 00 transition and 23 081 205 kHz for the 5 14 → 5 15 transition. One of the nitrogen spin-rotation parameters was also determined: C(5 14) – C(5 15) = 1.2 ± 0.6 kHz.

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