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Cyclopropenone was first detected in the cold and less dense envelope ofSagittarius B2(N). It was found later in several cold dark clouds and it may bepossible to detect its minor isotopic species in these environments. Inaddition, the main species may well be identified in warmer environments. Weaim to extend existing line lists of isotopologs of c-H2C3O from the microwaveto the millimeter region and create one for the singly deuterated isotopolog tofacilitate their detections in space. Furthermore, we aim to extend the linelist of the main isotopic species to the submillimeter region and to evaluatean equilibrium structure of the molecule. We employed a cyclopropenone samplein natural isotopic composition to investigate the rotational spectra of themain and 18O-containing isotopologs as well as the two isotopomers containingone 13C atom. Spectral recordings of the singly and doubly deuterated isotopicspecies were obtained using a cyclopropenone sample highly enriched indeuterium. We recorded rotational transitions in the 70-126 GHz and 160-245 GHzregions for all isotopologs and also in the 342-505 GHz range for the mainspecies. Quantum-chemical calculations were carried out to evaluate initialspectroscopic parameters and the differences between ground-state andequilibrium rotational parameters in order to derive semi-empirical equilibriumstructural parameters. We determined new or improved spectroscopic parametersfor six isotopologs and structural parameters according to different structuremodels. The spectroscopic parameters are accurate enough to identify minorisotopic species at centimeter and millimeter wavelengths while those of themain species are deemed to be reliable up to 1 THz. Our structural parametersdiffer from earlier ones. The deviations are attributed to misassignments inthe earlier spectrum of one isotopic species.

Rotational spectroscopy of isotopic cyclopropenone, $c$-H$_2$C$_3$O, and determination of its equilibrium structure