Vibrational excitation by positron collisions with molecular gases: a study of O2 and NO targets
Dipartimento di Chimica, Università di Roma, Città Universitaria, 00185 Rome,
Revised: 3 June 1999
Published online: 15 September 1999
The scattering of slow positrons from and NO molecules is treated using exact static interactions and a model potential for correlation-polarisation forces. The quantum coupled equations for the elastic scattering are extended to vibrationally inelastic processes and the different excitation probabilities are evaluated. Comparison with existing experiments for the NO target indicates that the present calculations provide a realistic treatment of positron scattering below Ps formation and give computational estimates on the efficiency of such projectiles in producing vibrationally excited molecules in the ambient gas.
PACS: 34.50.Gb – Electronic excitation and ionization of molecules; intermediate molecular states (including lifetimes, state mixing, etc.) / 34.80.Bm – Elastic scattering of electrons by atoms and molecules
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999