Elastic collisions of low-energy positrons with tetrahydrofuran.

Abstract

We report a study on the scattering of low-energy positrons by the biological relevant molecule tetrahydrofuran. The present calculated integral and differential cross sections were obtained with the Schwinger multichannel method in the static plus polarization approximation. The Born closure procedure was employed to account for the long range potential due to the permanent dipole moment of the molecule. The present results are compared with the available experimental data of Zecca et al. [J. Phys. B 38, 2079 (2005)] and Chiari et al. [J. Chem. Phys. 138, 074301 (2013)], and with the theoretical results of Franz and Gianturco [J. Chem. Phys. 139, 204309 (2013)] and Chiari et al. In general, we found a good agreement between our results and the experimental data, whereas the calculated integral cross sections (ICSs) obtained with different methods differ in magnitude. We also found a very good agreement between our calculated differential cross sections and the results of Franz and Gianturco and also with the experimental data of Chiari et al. Moreover, we also employed our calculated differential cross sections to provide a correction of the experimental total cross section of Zecca et al., due to the angular resolution errors, which improved the agreement between our ICSs and the experimental data of Zecca et al.