Low-Energy Positron Scattering by Pyridine and Aniline.

Calculated differential and integral cross sections for elastic scattering of low-energy positrons by pyridine and aniline are presented here. The cross sections were obtained using the Schwinger multichannel method in the static-plus polarization approximation, and the Born closure procedure was employed to account for the long-range potential due to the permanent dipole moment of the molecule. The elastic integral cross sections are compared with available theoretical and experimental data for the same molecules finding an overall good agreement. The present results are also compared with available calculated cross sections for the close-related molecules benzene and pyrimidine, where an overall similar angular behavior of the differential cross sections is found.