Interstellar Detection of Vibrationally Excited Transitions of Organic Molecules. The Bologna Laboratory Support

In the ongoing effort to detect complex organic molecules (COMs) in star-forming regions, support from laboratory spectroscopy is essential. Several COMs contribute to the observed spectra, which are fairly crowded, and additional spectral complexity may result from the vibrational excitation of the more abundant species. Therefore a comprehensive characterization of the rotational spectra is needed to allow the identification of low-abundance COMs. This work reports the cases of two interstellar organics, cyanoacetylene (HC3N) and aminoacetonitrile (NH2CH2CN), whose accurate descritpion of the ro-vibrational energies, obtained from FT-IR, FIR and millimeter-wave spectra recorded in the laboratory, has given a contribution to the analysis of spectral line surveys with regards to the molecules in vibrationally excited states.