Abstract
We report the quantum close-coupling dynamical equations which are relevant for describing vibrationally inelastic processes in low-energy collisions between a beam of positrons and the CH 4 molecule. The interaction potential we employ to model the forces at play is described in detail and we report also our numerical technique for solving the scattering equations. The cross sections are obtained for the vibrational excitations of the symmetric and the antisymmetric bond-stretching modes of the CH 4 molecule and are compared both with simpler approximations and with recent experiments observing the energy losses into the two combined modes. Our calculations turn out to reproduce the energy dependence of the experimental findings, but not their absolute values, especially near threshold.
Published Version
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