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Despite that the tricarbon monosulfide (C 3 S) is among the first sulfur-containing carbon-chain molecules to be detected in the interstellar medium, no studies focused on the determination of its collisional rates. These rate coefficients are essential to estimate the abundance of C 3 S in the interstellar medium. Computations of the C 3 S(   $^{1}\Sigma^{+}$  Σ + 1 ) downward rate coefficients, induced by collision with He, are performed by averaging the integral cross sections at low temperature (below    $25~\text{K}$  25 K ). Calculations of the cross sections in the close-coupling quantum time independent formalism for    $E_{c}\leq110~\text{cm}^{-1}$  E c ≤ 110 cm − 1 and    $J\leq10$  J ≤ 10 are based on a new 2-D potential energy surface. This PES is obtained from the explicit correlated coupled cluster with a single, double and perturbative triple excitation [ccsd(t)-f12] ab initio approach and the aug-cc-pVTZ basis sets. The PES have a global minimum of    $-55.69~\text{cm}^{-1}$  − 55.69 cm − 1 located at    $R=6.25$  R = 6.25 bohr and    $\theta=94^{\circ}$  θ = 94 ∘ , and a second minimum of    $-36.95~\text{cm}^{-1}$  − 36.95 cm − 1 at    $R=9.35$  R = 9.35 bohr and    $\theta=0^{\circ}$  θ = 0 ∘ . A comparison of C 3 S rates with those of the isoelectronic molecule C 3 O was made. The results indicate a great temperature dependence of the rates for transitions of    $\Delta J&gt;2$  Δ J &gt; 2 . We expect that the new collisional data will allow for accurate determination of the C 3 S abundance in several interstellar regions.

Rotational de-excitation of tricarbon monosulfide (C3S) in collision with (He): potential energy surface and rates