Abstract
Context. Deuterated forms of CH3 + are thought to be responsible for deuterium enrichment in lukewarm astronomical environments. There is no unambiguous detection of CH2 D+ in space to date.Aims. Four submillimetre rotational lines of CH2 D+ are documented in the literature. Our aim is to present a complete dataset of highly resolved rotational lines, including millimetre (mm) lines needed for a potential detection.Methods. We used a low-temperature ion trap and applied a novel IR–mm-wave double resonance method to measure the rotational lines of CH2 D+ . Results. We measured 21 low-lying (J ≤ 4) rotational transitions of CH2 D+ between 23 GHz and 1.1 THz with accuracies close to 2 ppb.
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