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Modeling of molecular emission from interstellar clouds requires the calculation of rate coefficients for excitation by collision with the most abundant species. Based on new highly correlated potential energy surfaces, rotational excitation of C2 H and C2 H− radicals in collision with He are investigated. C2 H fine and hyperfine structure is taken into account. As already found for other systems, rate coefficients for the C2 H− ion are larger by a factor up to 3 compared to the neutral species.

Rotational excitation of small carbon chains by collisions with He in the ISM