Abstract
We report a theoretical study and the computational results on vibrational excitations by positron impact of the polyatomic molecules CH4 and C2H2 as examples. The study has been carried out using the body-fixed vibrational close-coupling (BF-VCC) method which is relevant for describing vibrationally inelastic processes in low-energy collisions. The interaction potential we employ to model the forces at play is described in detail and we also report our numerical techniques for solving the scattering equations. The cross-sections are obtained for the vibrational excitations of the symmetric (ν1) and the antisymmetric (ν3) stretching modes of the H2O molecule and for the symmetric stretching (ν1) mode of C2H2, and they are compared with simpler available approximations.
Published Version
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