SIMBAD references

The low-temperature rotational (de-) excitation of C₃(X¹Σ⁺_g) by collisions with He (¹S) is studied using an ab initio potential energy surface (PES). This PES has been calculated using the single- and double-excitation coupled-cluster approach with noniterative perturbational treatment of triple excitations [CCSD(T)] and the augmented correlation-consistent triple-ζ basis set (aug-cc-pVTZ) with bond functions. This PES is then incorporated in full close-coupling quantum scattering calculations for collision energies between 0.1 and 50/cm1 in order to deduce the rate constants for rotational levels of C₃ up to j=10, covering the temperature range 5-15 K.