Spin-polarization of electron beams elastically scattered by Ar, Kr, and Xe atoms

30 March 2021 | 16:00
Virtual/Online

It is well known that an electron beam initially not polarized, i.e composed of equal numbers of particles polarized parallel and antiparallel to the incidence direction, due to the scattering becomes polarized. Such a result can be demonstrated within the theory of the spin-polarization of electron beams elastically scattered by atoms, which we briefly summarize. Then the POLARe program suite is described. POLARe is a set of computer codes aimed at the calculation of the spin-polarization parameters of electron beams elastically interacting with atomic targets. The results of the computation depend on the electrostatic potential. We calculate the electrostatic potential by multiplying the Coulomb potential by a screening function. The screening function is included in order to take into account the contribution of the atomic electron cloud on the electrostatic potential. The effect of the use of two popular screening functions, one proposed by Cox and Bonham and the other one by Salvat et al., on the calculated values of the spin-polarization parameters, is described. Selected results of the program concerning Ar, Kr, and Xe atoms are shown, demonstrating that the quantum-relativistic theory of the polarization of electron beams elastically scattered by atoms provides results in agreement with experimental data down to energies smaller than a few eV.

People

  • Speaker
    ECT*
    Head of the Interdisciplinary Laboratory for Computational Science (LISC) at the European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*) (Trento). Ph.D.: Materials Science and Engineering. M.Sc.: Physics. National Scientific Habilitation to Full Professor in Theoretical Physics of Matter and in Experimental Physics of Matter. Visiting Professor: Departamento de Física, Univesidad de Murcia (2020), Departamento de Física Aplicada, Universidad de Alicante (2016). Leverhulme Visiting Professor: Department of Materials Science and Engineering at the University of Sheffield (2015). Scientific Consultant: Integrated Systems Laboratory at the Swiss Federal Institute of Technology (ETH), Zurich (2009). Research Associate: Department of Engineering Materials at the University of Sheffield (2007-2008). He is a member of the American Physical Society, the European Physical Society, and the Italian Physical Society (prize 1990). He is author of the books Electron-Beam Interactions with Solids , Springer Tracts in Modern Physics, vol. 186, Springer, 2003 and Transport of Energetic Electrons in Solids, Springer Tracts in Modern Physics, vol. 257, Springer, 2014 (first edition), 2017 (second edition), 2020 (third edition), and has published more than 120 papers.

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