Department of Chemistry2024-11-0920201387-380610.1016/j.ijms.2020.1164262-s2.0-85091222973https://hdl.handle.net/20.500.14288/303The potential energy surfaces for C2− (Σg+2) interacting with He, Ne and Ar are calculated using ab initio quantum chemistry methods. The PES are used to carry out coupled-channel quantum scattering calculations for the three systems to obtain the rotationally inelastic scattering cross sections from which the rotationally inelastic state-changing rate coefficients are computed. These rate coefficients are then used to compute thermalisation times of C2− in an ion trap employing He, Ne or Ar as different, and possible, buffer gases. A detailed analysis of their comparative collisional efficiencies is presented for guidance in trap modeling studies.pdfPhysics, atomic, molecular and chemicalSpectroscopyJournal Article1873-2798https://doi.org/10.1016/j.ijms.2020.116426579445000013Q3NOIR02401