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- W2922103673 abstract "Context . Detection of deuterated species may provide information on the evolving chemistry in the earliest phases of star-forming regions. For molecules with two isomeric forms of the same isotopic variant, gas-phase and solid-state formation pathways can be differentiated using their abundance ratio. Aims . Spectroscopic databases for astrophysical purposes are built for the two mono deuterated isomeric species CH 2 DCOH and CH 3 COD of the complex organic molecule acetaldehyde. These databases can be used to search and detect these two species in astrophysical surveys, retrieving their column density and therefore abundances. Methods . Submillimeter wave and terahertz transitions were measured for mono deuterated acetaldehyde CH 2 DCOH which is a non-rigid species displaying internal rotation of its asymmetrical CH 2 D methyl group. An analysis of a dataset consisting of previously measured microwave data and the newly measured transition was carried out with a model accounting for the large amplitude torsion. Results . The frequencies of 2556 transitions are reproduced with a unitless standard deviation of 2.3 yielding various spectroscopic constants. Spectroscopic databases for astrophysical purposes were built for CH 2 DCOH using the results of the present analysis and for CH 3 COD using the results of a previous spectroscopic investigation. These two species were both searched for and are detected toward a low-mass star-forming region. Conclusions . We report the first detection of CH 2 DCOH (93 transitions) and the detection of CH 3 COD (43 transitions) species in source B of the IRAS 16293−2422 young stellar binary system located in the ρ Ophiuchus cloud region, using the publicly available ALMA Protostellar Interferometric Line Survey." @default.
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- W2922103673 date "2019-04-01" @default.
- W2922103673 modified "2023-10-03" @default.
- W2922103673 title "Astrophysical detections and databases for the mono deuterated species of acetaldehyde CH<sub>2</sub>DCOH and CH<sub>3</sub>COD" @default.
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- W2922103673 doi "https://doi.org/10.1051/0004-6361/201834827" @default.
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