Abstract
Quantum mechanical closed coupling scattering calculations are carried out at temperatures ranging from 10-8 K to 100 K for studying rotational transitions of C2 due to collisions with 3He and 4He employing our new C2-He potential energy surface computed at the CCSD(T)- F12b/aug-cc-pVQZ level of theory. Among the isotopes of He, the heavier 4He isotope has larger value of rotational quenching cross section than 3He isotope. Wigner’s threshold law holds below 10-1 cm−1. Quenching rate coefficients suggest that C2 can be cooled with 4He buffer gas. The dominance of 4He on C2 molecule is further addressed by calculating the predissociation lifetime of C2.
Published Version
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