Rotational spectrum of 3-aminopropionitrile and searches for it in Sagittarius B2(N)
Résumé
Aminoacetonitrile (NH 2 CH 2 CN) was detected in the interstellar medium (ISM) one decade ago in the course of a spectral survey of the hot molecular core Sagittarius (Sgr) B2(N) with the IRAM 30 m telescope. With the advent of sensitive telescopes such as the Atacama Large Millimeter/submillimeter Array (ALMA), the degree of chemical complexity in the ISM can be further explored. In the family of aminoacetonitrile, the next stage in complexity with one additional CH 2 group is aminopropionitrile. This molecule has two structural isomers, a chain-like (3-aminopropionitrile, NH 2 CH 2 CH 2 CN) and a branched, chiral one (2-aminopropionitrile, CH 3 CH(NH 2)CN). The latter was studied in the laboratory a few years ago and was not detected in the IRAM 30 m survey. We present the search for both isomers in the EMoCA (Exploring Molecular Complexity with ALMA) survey, a sensitive spectral survey of Sgr B2(N) performed with ALMA. The rotational spectrum of 3-aminopropionitrile has been recorded in laboratory with a submillimeter spectrometer using solid-state sources. Helped by ab-initio calculations performed for the different possible conformations, we present here the analysis based on a Watson Hamiltonian for an asymmetric one
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