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Abstract:
Pure inversion spectra for the |J,K⟩=|1,1⟩ level of 14ND3 and of 15ND3 are recorded at 10 kHz resolution using a molecular-beam microwave-UV double-resonance spectrometer. The observed spectra are fully assigned, and the energies of all |J,K⟩=|1,1⟩ hyperfine levels of both deuterated ammonia isotopomers are obtained. The shifting and splitting of the manifold of hyperfine levels in external electric fields is calculated and its implications for molecular-beam deceleration and trapping experiments are discussed.