Laboratory Investigation of Astronomical Reactive Species: the Vibrational Satellites of c-C3H2 Re-Visited

Marie-Aline Martin-Drumel, Bryan Changala, Harshal Gupta, J.~H. Westerfield, Olivier Pirali, Sven Thorwirth, Joshua H. Baraban, John F. Stanton, Michael C. McCarthy

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Cyclopropenylidene (c-C3H2) is one of the few polyatomic hydrocarbons ubiquitous in our galaxy, despite its reactive carbene nature (see e.g. [1]). Because it is so widely distributed in space, and because its 13C, D, and D2 isotopologues have also been detected (see e.g. [2]), c-C3H2 is an ideal probe of the physical conditions in various astrophysical objects. It is surprising though that its vibrational satellites have yet to be detected in the interstellar medium. To enable the interstellar detection of vibrationally excited c-C3H2, and observe for the first time the elusive ν4 and ν9 vibrational modes, we have undertaken an extensive investigation of its spectrum from the centimeter to the submillimeter wavelengths, resulting in the observation of many new vibrational satellites in a promising spectral region for astronomical observations. Our measurements are supported by anharmonic rovibrational calculations using a high-quality ab initio potential energy surface, with particular attention paid to the ν4/ν9 Coriolis interaction.
Original languageEnglish GB
Title of host publication73rd International Symposium on Molecular Spectroscopy
StatePublished - 1 Jun 2018


  • Astronomy


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