Far-infrared laser magnetic resonance spectrum of NHD

Far-infrared laser magnetic resonance spectra of NHD (X ²A′') (0,0,0) have been observed. Data are presented for the rotational transitions 3₁₃ ← 2₀₂ and 4₁₃ ← 3₂₂ observed at wavelengths of 211.3 and 374.1 μm respectively. Theoretical values of the transition magnetic field strengths have been calculated using the best available molecular constants. The agreement between theory and experiment confirms our spectroscopic assignments, but indicates that with further experimental data, considerable refinement of the molecular constants will be obtained.