Abstract
We present recent results for positron–molecule scattering obtained with the Schwinger multichannel method. Our calculations include integral, differential and momentum transfer cross sections and the annihilation parameter Z eff for C 2H 2 and C 2H 4 molecules. We discuss a mechanism for annihilation of positrons in low-energy positron–molecule scattering. We interpret the annihilation process through virtual electronic excitation of the target combined with electronic cloud relaxation and virtual positronium formation. We study the influence of the first electronic state of the target on the cross section and on the annihilation parameter in e +–C 2H 2 scattering.
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