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Context.  An accurate analysis of the physical-chemical conditions in the regions of the interstellar medium in which C 3  is observed requires knowing the collisional rate coefficients of this molecule with He, H 2 , electrons, and H.   Aims.  The main goals of this study are to present the first potential energy surface for the C 3  +H 2  complex, to study the dynamics of the system, and to report a set of rate coefficients at low temperature for the lower rotational states of C 3  with para- and ortho-H 2 .   Methods.  A large grid of ab initio energies was computed at the explicitly correlated coupled-cluster with single-, double-, and perturbative triple-excitation level of theory, together with the augmented correlation-consistent quadruple zeta basis set (CCSD(T)-F12a/aug-cc-pVQZ). This grid of energies was fit to an analytical function. The potential energy surface was employed in close-coupling calculations at low collisional energies.   Results.  We present a high-level four-dimensional potential energy surface (PES) for studying the collision of C 3  with H 2 . The global minimum of the surface is found in the linear HH-CCC configuration. Rotational deexcitation state-to-state cross sections of C 3  by collision with para- and ortho-H 2  are computed. Furthermore, a reduced two-dimensional surface is developed by averaging the surface over the orientation of H 2 . The cross sections for the collision with para-H 2  using this approximation and those from the four-dimensional PES agree excellently. Finally, a set of rotational rate coefficients for the collision of C 3  with para- and ortho-H 2  at low temperatures are reported.

Deexcitation rate coefficients of C3 by collision with H2 at low temperatures

Deexcitation rate coefficients of C₃ by collision with H₂ at low temperatures