Abstract
We report rest frequencies for rotational transitions of the deuterated ammonium isotopologues NH3D+, and , measured in a cryogenic ion trap machine. For the symmetric tops NH3D+ and one and three transitions are detected, respectively, and five transitions are detected for the asymmetric top . While the lowest frequency transition of NH3D+ was already known in the laboratory and space, this work enables the future radio astronomical detection of the two other isotopologues.
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