Decoding millimetre-wave spectra of 2-iminopropanenitrile, a candidate for astronomical observations

Abstract

Aims. The recent detection of cyanomethanimine in the interstellar medium makes its methyl derivative, 2-iminopropanenitrile (CH 3 C(CN)NH), a promising candidate for an interstellar detection. The aim of this work is to extend the current knowledge of the laboratory rotational spectrum to higher frequencies, which is an essential prerequisite for an identification of the molecular species in the interstellar medium by millimetre-wave astronomy. Methods. The room-temperature rotational spectrum of 2-iminopropanenitrile has been measured in several frequency regions between 128 and 329 GHz. The A-E splittings of the rotational transitions arising from the methyl top internal rotation were analysed employing the ERHAM and XIAM programs. Results. A dataset of approximately 900 newly assigned rotational transitions in the ground state of the Z isomer and a set of refined molecular constants, including the internal rotation parameters, are reported. Moreover, this work provides the first spectral characterisation of the less stable E isomer ground state, as well as the three lowest-lying vibrationally excited states of the Z isomer, v 21 = 1, v 14 = 1, and v 20 = 1. This comprehensive spectroscopic study will allow a search for 2-iminopropanenitrile in the millimetrewave surveys of interstellar sources, such as those recorded by the Atacama Large Millimeter/submillimeter Array.

Millimetre-wave spectroscopy of 2-hydroxyprop-2-enal and an astronomical search with ALMA

“…Two different glass cells with lengths of 2.3 m and 2.8 m were used, and the optical path of the cells was doubled to 4.6 m and 5.6 m, respectively, using a roof-top mirror. For the spectral measurements, we adopted the same procedure as for 2-iminopropanenitrile (Luková et al 2022), which also revealed relatively low stability in the cell. The sample was introduced to the chamber and was kept there without pumping until the intensity of a selected rotational line decreased by 25 % of its original intensity.…”