Quenching rates and critical densities of c-C3H2

Khalifa, Malek Ben; Sahnoun, Emna; Spezzano, Silvia; Wiesenfeld, Laurent; Hammami, Kamel; Dulieu, Olivier; Caselli, Paola

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Quenching rates and critical densities of c-C3H2

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Spezzano, Silvia
Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society;

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Caselli, Paola
Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society;

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Khalifa, M. B., Sahnoun, E., Spezzano, S., Wiesenfeld, L., Hammami, K., Dulieu, O., et al. (2020). Quenching rates and critical densities of c-C3H2. Cambridge, UK: Cambridge University Press.

Cite as: https://hdl.handle.net/21.11116/0000-0008-15D1-4

Abstract

Cyclopropenylidene,, is a simple hydrocarbon, ubiquitous in astrophysical gases, and possessing a permanent electric dipole moment. Its readily observed multifrequency rotational transitions make it an excellent probe for the physics and history of interstellar matter. The collisional properties of with He are presented here. We computed the full Potential Energy Surfaces, and we perform quantum scattering in order to provide rates of quenching and excitation for low to medium temperature regimes. We discuss issues with the validity of the usual Local Thermodynamical Equilibrium assumption, and also the intricacies of the spectroscopy of an asymmetric top. We present the wide range of actual critical densities, as recently observed.