Collisional excitation of interstellar CCN(X2Π) induced by He.

摘要: The CCN radical has been recently detected in the interstellar medium. Accurate modeling of its abundance such media requires one to model excitation by both radiation and collisions. Here, we report first quantum mechanical close-coupling study CCN-He Calculations fine-structure resolved cross sections CCN(X2Π) induced collision with He are performed for kinetic energies below 500 cm-1. calculations based on new two-dimensional potential energy surfaces obtained from coupled cluster approaches. We found that inelastic spin-orbit conserving transitions larger than those changing transitions. collisional data should significantly help interpretation emission lines observed current future telescopes expect they will allow accurate determination medium, which is crucial understand chemistry carbon chain species gas.