The CH^-3Σ⁺ Anion: Inelastic Rate Coefficients from Collisions with He at Interstellar Conditions.

ABSTRACT: We present accurate ab initio calculations on several properties of a gas-phase system of interest in the interstellar medium (ISM), where the title molecular anion has been often surmised but not yet confirmed by observations. The CH^-3Σ⁺ constitutes the smallest term in the series of longer anionic polyynes which have been observed in the ISM (e.g., C₄H^- and several others). Hence, its dynamical behavior in collision with He atoms, one of the most abundant atoms in that environment, can provide quantitative indicators on the changes which can occur in the rotational state population of the title anion when driven by this collision dynamics. We therefore report an accurate evaluation of the full potential energy surface (PES) wh

SUBMITTER: Alonso de la Fuente J 

PROVIDER: S-EPMC9884083 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature