Abstract
Low-energy collisional excitation of rotational levels by impact with slow positron beams is considered by carrying out a space-frame (SF) dynamical calculation at energies well below the positronium formation threshold. The close-coupled quantum equations are solved exactly, using a recently developed modified variable phase approximation (MVPA) and the interaction forces include static interaction exactly and a local, DFT modelling of correlation–polarisation effects. The results are employed to obtain heating and quenching efficiency coefficients for a series of linear molecules in the gas phase and at low collision energies.
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